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Discovery Curriculum - Unit 3: Leader's Guide

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Discovery Curriculum - Unit 3: Leader's GuideParticipants and Leaders Guides available as Free digital downloads This is the Leader's Guide for Unit 3, Seeking the Mind of Christ: Renewing Your Functional Worldview of the four unit series, Discovery: A Biblical Support Group Curriculum for Men Pursuing Sexual Integrity. A free Participant's Guide is also available for Unit 3. Harvest USAs Discovery series brings the power of the gospel into mens struggles with sexuality. Drawing on more than 35

Participant’s and Leader’s Guides available as Free digital downloads

This is the Leader's Guide for Unit 3, Seeking the Mind of Christ: Renewing Your Functional Worldview of the four-unit series, Discovery: A Biblical Support Group Curriculum for Men Pursuing Sexual Integrity. A free Participant's Guide is also available for Unit 3.

Harvest USA’s Discovery series brings the power of the gospel into men’s struggles with sexuality. Drawing on more than 35 years of discipleship through biblical support groups, Discovery makes Harvest USA’s discipleship model accessible to local church ministry. Participants dive deeply into Scripture, learning to apply the promises and comforts of the gospel beyond their behaviors to the deepest issues of their hearts. Their personal encounters with God’s Word are strengthened and expressed in the context of small group discussion, where they learn to live the gospel, giving and receiving truth and mercy together.

The entire series consists of four units with 13 lessons each. Designed to be used in order, these units guide participants through a course of Bible study that systematically draws out personal discovery of how the gospel transforms shaping life experiences, controlling heart desires, functional beliefs, and resultant behaviors. A corresponding Leaders Guide is available for each unit, with additional notes to help group leaders facilitate with skill and grace.

For help on setting up a sexual discipleship group in your church, click here.

Unit 3, Seeking the Mind of Christ: Renewing Your Functional Worldview addresses a fundamental struggle for every believer: What we profess to believe about God and life often does not line up with what we functionally believe in our hearts. This unit challenges men to look deeply into what they truly believe, because transformed living will only come from a renewed mind in Christ.

Other units in this series include:

Unit 1, New Hope in Christ: Bringing Gospel Identity to Bear on Your Story starts with our gospel model for change that forms the structure of the entire curriculum. We then take a few lessons to establish a biblical understanding of the human heart. The second half of Unit 1 will help men bring new, gospel clarity to a variety of past and present experiences and situations that have exerted strong, shaping influence over our hearts.

Unit 2, Treasuring Christ: Transforming Your Heart’s Desires focuses primarily on the deeper desires of our fallen hearts that, apart from the transforming work of the Holy Spirit, will lead to idolatrous pursuits of sin. This unit not only shows men how Jesus transforms and redirects our desires but also illuminates the profound reality that, at our core, we are all much more alike than we are different.

Unit 4, Progress and Perseverance in Christ: Seeing Real Growth and Change shows how our hearts, circumstantial influences, desires, and beliefs all bear out in either good or bad fruit in our lives. This unit focuses on the good fruit men should expect and work towards through their union with Christ.

ABOUT THE AUTHORS

Discovery was written and organized by Jim Weidenaar and Mark Sanders. Jim and Mark also use Discovery in the biblical support group ministry that takes place in our Dresher and Pittsburgh offices.

Jim Weidenaar joined the Harvest USA staff in June of 2012 as Director of Church Equipping and the Greater Pittsburgh Region (GPR). He has a burden to help those struggling with sexual sin, that they will come to understand and experience progress in gospel repentance. Jim has a Masters Degree in Theological Studies (MTS) from Calvin Theological Seminary, Grand Rapids, MI, and a Doctorate in Historical and Theological Studies (PhD) from Westminster Theological Seminary, Glenside, PA. He resides in the eastern suburbs of Pittsburgh with his wife and daughter.

Mark Sanders joined Harvest USA’s Men’s Ministry in July 2015. Mark holds an MA in counseling from Westminster Theological Seminary and a BA in communications and integrated media from Geneva College. For five years, he taught English in South Korea, where he met his lovely wife. In addition to leading support groups and conducting one-on-one discipleship, Mark also serves on Harvest USA’s teaching staff and has produced all of their video resources. In February 2021, Mark became Director of Discipleship at Harvest USA.

 

ENDORSEMENTS

“I love this curriculum, and I will recommend it often. I appreciate that the gospel is the lens through which everything about sexual struggle and sexual integrity is understood. Here are three of the many ways I found the Discovery curriculum both unique and practically helpful. First, it is honest about the labyrinthian nature of sin. Second, it acknowledges the power of external influences and experiences on what a person thinks, desires, and does. Finally, it very importantly and helpfully roots change in our new identity and potential in Christ, not just in acknowledging the wrong thoughts and desires of the heart. This is a wonderful gospel tool addressing a very significant area of personal struggle and cultural chaos. May it find a huge audience and bear a wide harvest of good fruit.”

– Paul David Tripp, Author, New Morning Mercies, How People Change, and Sex in a Broken World

“For nearly four decades, Harvest USA has been helping men pursue sexual integrity. So it’s not surprising to me that these lessons are biblically anchored and oriented toward life in the local church. I heartily recommend this curriculum.”

– Michael Horton, Professor of Theology and Apologetics, Westminster Seminary California

“Harvest USA’s Discovery series is more than a spiritually insightful, biblically faithful guide for Christian men struggling with sexual sin. It gets behind behavior to the desires that move us, the experiences that form us, the worldviews that guide us, and the actions that reveal us, all so that we might grow in the freedom and knowledge of Christ. May God use these studies to bless thousands.”

– Rev. Dr. R. Carlton Wynne, Associate Pastor at Westminster Presbyterian Church (PCA) (Atlanta) and Adjunct Professor of Systematic Theology at RTS-Atlanta

“Sexual sin is harming men, women, and children more than we fully understand. Harvest USA’s Discovery series has practical help and gospel hope for men who want to change. Based on decades of theological reflection and informed by real experience with men whose lives are being formed into the image of Christ, this biblical, rich curriculum is proven to produce spiritual freedom through sexual purity.”

– Philip Ryken, President, Wheaton College

“When navigating issues of human sexuality, brokenness, and redemption, I find myself returning to the cumulative wisdom and experience of the Harvest USA team. This latest support group curriculum for men pursuing sexual integrity is yet another example of that. Grounded and soaked in biblical truth, it is also brimming with the lived experiences of counselors whose lives have been dedicated to helping men in this area. I cannot commend it more highly to be used in your church, your small groups, and your care ministries.”

– Jonathan D. Holmes, Executive Director, Fieldstone Counseling, and Pastor of Counseling, Parkside Church (Chagrin Falls, Ohio)

“In my 25 years of working on college campuses and in the church, this is the best curriculum that I have discovered to help men feeling defeated by sexual sin. It has been tested in the suffocating fires of disillusionment, doubt, and discouragement—and, like pure gold, the result is incomparably precious.”

– David Kieffer, Associate Pastor of Adult Ministries, Westminster Presbyterian (PCA) (Lancaster, PA)

“This Harvest USA group curriculum isn’t full of false promises or easy answers. It points us toward a long haul through the wilderness, but with God’s presence, his provision, and his people to sustain you. It can be a hard journey, but traveling there as a group makes it much more doable. This guide will take you there through Bible study and Christian community.”

– Rev. Michael Gembola, LPC, Author, After an Affair: Pursuing Restoration

“This is more than a curriculum—this is a warm and personal pathway out of dark struggles toward a walk with Christ in the light. Expect not just realism and practical wisdom, but a grace-filled journey together that will lead many to nothing short of renovation of the heart. As a struggler, I need this resource, and, as a pastor, I will use it.”

– Ste Casey, Pastor, Speke Baptist Church (Liverpool, UK), and Executive Member and Tutor, Biblical Counselling UK

“Connecting the mind and the heart is no easy task, but it is a critical element of healing for any sexually compulsive man. By combining penetrating biblical insight with carefully guided written and oral self-disclosure over a many-month period of time the Harvest USA Discovery group curriculum is a powerful tool to not only make the connection, but to significantly address and resolve the shame that binds the hearts and minds of the sexually broken.”

– Randall B. Hicks, Clinical Psychologist, PsyD

“I’ve served for fourteen years as Harvest USA’s Women’s Ministry Director and journeyed with hundreds of wives who have been devastated by their husband’s sexual sin. The majority of these dear women represent Christian husbands who don’t understand why they are in bondage to these devastating behaviors. Many of these brothers come to Harvest USA after years, if not decades, of being stuck in sin and desperate for someone to give them practical, Christ-centered guidance that results in true and lasting change in their hearts, emotions, thoughts, and decision-making. I am so grateful for my colleagues Jim and Mark and their faithful years of discipleship to men, which now bears out in this wonderful workbook. Grab all four of these workbooks, which apply the gospel with biblical wisdom and brotherly compassion from two men who have been in the trenches day after day with men seeking a way out of sexual addiction.”

– Ellen Mary Dykas, Women’s Ministry Director, Harvest USA, and Co-author, Sexual Faithfulness: Gospel-infused, Practical Discipleship for Women

“We have found the Discovery curriculum very helpful in our men’s small groups. It has been great to focus on reading Scripture, interpreting it, and applying it to our lives. The discussion questions encourage men to think deeply about the roots of their struggles and to pursue Christ to be changed, and the Leader’s Guide makes sure we get all we can out of our group discussion.”

– Steve Roskos, Partner Ministry Leader

“Harvest USA has been pivotal in my fight against sexual sin. The combination of Christian community and a Christ-centered curriculum provided me with powerful tools in this fight. The curriculum is comprehensive, taking students through lessons on so many important topics, including desires, beliefs, behaviors, and past influences. Every lesson is solidly connected to Scripture so that we were able to see what God’s Word has to say about our struggle and how to best fight. Each week involved personal reflection and application so that our group went from intellectual understanding to heart change. Working with this curriculum over a period of 18 months really had a huge impact on my life, and I continue to refer to it as I fight my battle and grow in Christ.”

– Paul, Harvest USA Ministry Recipient and Men’s Support Group Participant

“After struggling for decades with pornography, Harvest USA’s Discovery series helped me rightly deal with my deep-seated sin. Working through each section with a caring men’s group, I realized how I was haunted by deeper issues, how my sin was triggered by unacknowledged fears and anxieties, and—through it all—how Christ can truly satisfy my deeper longing for love and peace.”

– Jim, Harvest USA Ministry Recipient and Men’s Support Group Participant

“The Discovery curriculum has been a wonderful resource for both my facilitation of a group and also for me to personally learn more about the hope Jesus gives in the battle with sexual sin. As an inductive Bible study, we are pointed to the source of truth every week. Participants are directed to see how their own experiences, beliefs, and desires are what ultimately generate the fruit in their lives and how what has been fallen can be renewed in Christ.”

– Anonymous, Harvest USA Men’s Support Group Leader

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Alexandria, US
★★★★★ 3
Neutral
Size: 4.5"
She chewed it up in less than 10 minutes. This is not for heavy chewers but dogs that like to actually play with their toys it would be great!!! I gave it a 3 because it worked for my other dog who likes to play🤘
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Reviewed in the United States on March 8, 2026
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Betsy
Natrona Heights, US
★★★★★ 5
One of the best dog toys I’ve found
Color: Blue, Color: Blue
My Great Dane puppy- at 140lbs, loves this!! We had another one that was plastic and it worked ok but this is so much better! Interactive, soft to play with, battery last a long time & he does not get bored with it. Besides is plush lamb chops, best toy ever bought for him.
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Reviewed in the United States on May 25, 2026
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K. Brittain
Belleville, US
★★★★★ 5
Keeps my wild child busy!
Color: Orange
*UPDATE 1/10/26* Does my pup love it? Yes. 5 stars for that. His big thing is just holding it in his mouth though, and laying down with it. Then he will put it down, and as soon as it rolls away he gets up and grabs it again. He definitely requires attention from his humans when it’s turned on…kind of defeats the purpose of why I bought it! He’s a needy boy, that’s for sure, so it’s not the toy’s fault. Two improvements I’d love to see though, are 1) the ability to turn off that yappy bark. I think my dog is more excited about it moving and not so much the yapping. Not that it’s bad, but my boy doesn’t bark much so I’m used to a quieter household. And 2) when removing the base for powering off, there should be a sensor so it doesn’t keep spinning in the socket, occasionally slipping out and hitting the floor. I worry about it breaking due to this. This thing arrived today and we couldn’t wait till Christmas to give it to our high play drive Australian Shepherd. It’s been barely above zero for weeks with no end in sight, and I have cold weather asthma so I really try to limit my exposure to the elements. Needless to say, my dog has been B O R E D. He truly craves interactive play with his humans, but last week I bought a cheap r/c cat toy that really caught his attention. So I splurged on this toy and so far, it’s AWESOME. He can’t control himself when the rope starts spinning. He pounces on it and it goes spinning off and around. He keeps picking it up thinking it’ll stop, but it keeps going. After 5 minutes of play he was acting completely gassed, but he just can’t resist it, as he put it down to get a drink of water and it started spinning again. Forget the water, I need that toy! As long as this thing can handle the teeth, slobber, dirt and grime, I’ll be a repeat customer!
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Reviewed in the United States on December 22, 2025
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Jack H
Grantham, US
★★★★★ 4
My dog loves it...but needs charging four, five times a day. You really need 2 for full-time play
Color: Blue
My dog loves this toy. The first time she saw it and it started rolling, bounding, and waving the ropes around...she was barking at it, chasing it, grabbing it, jumping all over the place. There is no other toy she has that she will leave this for. And...that's part of the problem. I have to take this away from her three, four, five times a day to recharge it. The charge barely lasts an hour and the toy is dead. And it takes over an hour to charge it all the way up. Which means she plays with it less than it spends charging. That's not ideal. The product page and manual that comes with the toy says there is a 10-minute play period followed by a 30-minute interval to let the dog cool down...not get overly stimulated. I have never seen a cool-down period. I don't know if it's because the dog plays with it, shakes it around, tosses it and chases it, etc., etc., etc. constantly...but it just keep going until the battery is dead. I wish it did have a cool-down period. She likes playing with the ropes and rolling it around herself even after the battery dies, so if there was a cool-down, maybe it wouldn't need to be charged many times a day. Once it's charged and she sees me putting it back together, she gets very excited and starts jumping up and trying to grab it. Our corgi reduces most rope toys to threads in a day or less, and this one has held up surprisingly well against her super-chewing habits. The material the ball part is made of is very durable (we have a couple other toys with the same type of shell) and she's chewed on them all a lot without any damage. The toy keeps her entertained and happy...when it's not on the charger. I wish it was a good-enough value for the money to be able to justify buying two of them so I could have one charging while she was playing with the other. ================= I'm adding 1 star, because the company customer service is outstanding. They emailed me about my concerns vis-a-vis the short battery life, and it seemed that they really listened and cared about my input. I don't know what, if anything, can be done to extend the battery life given that it's spinning some substantial pieces of rope around, but I think they'll do as much as they can. In the meantime, my dog's love for this toy has not diminished in the least. She still gets very excited when she sees me starting to put it together after it's done charging, and she ignores everything else (sometimes even offers of treats) to play with it. I have a second one now, and I can almost keep them going full-time, but the few minutes every couple hours when both of them are on the charger is probably good for her anyway...she'd probably be over-stimulated if she had one of these to chase non-stop. Summary: Great toy, lots of fun, my dog loves it. However, you really need two the way things are right now unless you are okay with your dog being able to play less than half the time.
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Reviewed in the United States on March 13, 2026
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K9lover
Lowell, US
★★★★★ 5
My German Shepherd loves it!
Color: Blue
My GSD loves this thing! It bounces and the rope thing wiggles and spins. She is supervised while playing with it. The charge lasts about an hour or so. The only thing that is a little annoying is it makes a little barking sound on one of the settings. It screws apart for easy access. So far she's not been able to destroy it but she has opened it so definitely supervise playing time. It rolls around and bounces on the carpet and on the hard floor it jumps a little bit. Can be loud on hard floors. It's a soft rubber kinda texture that is easy to rinse off and clean. Probably best for indoor use or use on decks or patios. Keeps her very engaged and I have a blast watching her and playing with her with this thing!
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Reviewed in the United States on March 18, 2026

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