Welcome to In-Depth Studies!

IDS is a teaching ministry of Geoff Volker. Our purpose is to stimulate your thinking on significant Biblical issues. Our theological point of view is that of the Reformation in that we hold to the Doctrines of Grace (TULIP). We differ from Reformation theology in areas such as infant baptism and the Sabbath. We also teach from the perspective of New Covenant Theology. Take your time and browse our site – we hope we can be a useful resource for you!


The pages of our site are loaded with theological articles on a wide range of topics explaining our views. Be sure to visit the Reading Room while you’re here and feel free to download anything of interest to you. Don’t forget to visit Theological Inquiry as well. Theological Inquiry is the section of our site that provides you the opportunity to interact with us in asking any theological question that you’re facing.

New Book

Picture-Fulfillment: A Study in New Covenant Theology

“Excerpt 2 | What is a Covenant?


What is a Covenant?

There is no debate that the concept of the covenant is a significant idea in Scripture (1 Corinthians 11:25, Hebrews 8, Galatians 4:21-31). But there is much debate concerning what is a covenant and how we are able to identify a covenant.

Let’s first tackle the question as to exactly what is a covenant? I would say that a covenant is some sort of an arrangement between two parties. In saying what I have said I am very aware that my definition is a bit vague, but it is vague by design. In Scripture there are a variety of types of covenants. We will examine each covenant…” Read more


Learn About New Covenant Theology

Want to systematically learn about New Covenant Theology? Listen to our 26-session audio course to get started!

Current IDS Newsletter

Read the current IDS Newsletter.

The In-Depth Studies Blog

A way to keep up with the latest theological ramblings of the IDS blog team. You’ll have the opportunity to interact with the IDS bloggers on a wide variety of subjects.

In-Depth Studies Audio

A clearinghouse for In-Depth Studies audio files from a variety of IDS speakers.

Subscribe to our Email Newsletter



Critics Choice Vacations

Planning a personal trip or family vacation? Enjoy your destination hassle-free with Critics Choice Vacations, the official travel agents for In-Depth Studies. Susan and Curtis Boehnstedt are good friends and believers, so we heartily recommend their service to you. Get started today by visiting their website: http://criticschoicevacations.com/


Recent Posts

IDS Newsletter, May 2016


In-Depth Studies, P.O. Box 3482, Gilbert, AZ 85299

Question to Ponder

If the Mosaic Law as a whole no longer applies to believers who live in the New Covenant era (1 Corinthians 9:20-21) how do we prove that bestiality (Leviticus 1:23) is still a sin as it was under the Mosaic Law?

Now for the matters you wrote about: It is good for a man not to marry. But since there is so much immorality, each man should have his own wife, and each woman her own husband.  (1 Corinthians 7:1-2, NIV1984)

  • In 1 Corinthians 7:1-9 Paul tells us that the lawful outlet for sexual drive of the believer is marriage.
  • Any attempt to satisfy the sexual drive outside of marriage is immorality.
  • Bestiality is an attempt to satisfy the sexual drive outside of marriage and is therefore immorality and sin in the eyes of God.
  • It should also be said that premarital sex is an unlawful or sinful attempt to satisfy the sexual drive outside of marriage and is therefore immorality.
  • 1 Thessalonians 4:3-8 is an application of this teaching on immorality.
  • Once again it is stated that sexual immorality is an attempt to satisfy our sexual passions outside of marriage.
  • 1 Thessalonians 4:3 tell us to “avoid sexual immorality.” Immorality has been defined as any attempt to satisfy the sexual drive outside of marriage. Therefore we do not need a specific passage to tell us that bestiality is a sin under the Law of Christ.

Family Update

2016 will be quite a year for grandchildren in our family. Our youngest daughter Debby has already had her first baby (Caleb) in January. Our eldest daughter Samantha is due to have her 4th child, a baby boy, at the beginning of July. Staci, the wife of Zach, is also due to have her 4th child, a baby girl, at the beginning of July. Finally, Heather, the wife of Geoff Jr., will have her 2nd child, sex to be determined, in December. If all goes well Priscilla and I will have 11 grandchildren by the end of 2016.

New Ministry Address!

Since In-Depth Studies is under New Covenant Bible Fellowship our address is tied to the church’s address. The church’s address has now been changed. The new address for IDS is now In-Depth Studies, PO Box 3482, Gilbert, AZ 85299. Please send your support and any other correspondence to the new address. Since the old address is my home address (3324 E. Enid Ave., Mesa, AZ 85204-4836) I will be still accepting mail at that address. If you have any questions please contact me.

Travel expenses that I still need to raise for the trip to Romania

Romania (August 29-September 13)

I still need $1,400 for this trip.

The cost for the other trips out of the country has been covered. I only need to raise the funds to cover the trip to Romania. If you wish to help out with this trip then you could give by credit card (using www.ids.org and the pay pal button), check (made out to IDS), or an electronic check from your bank to IDS (using the ministry address). Cash is also accepted.


To the Southwest of England (May 11-16)

This is a conference on New Covenant Theology in the south of England. I will be teaching along with David Gay and Frederick Serjeant.

To Belarus (May 17-30)

Once again I will be in Belarus. I have been coming to Belarus since 1996. The topic of the conference is “How to Resolve Conflict Biblically.”

To Boalsburg, PA (June 23-27)

I will be giving a weekend conference on “New Covenant Theology” at Grace Fellowship of Boalsburg, PA. The pastor is Keith Doster and he heads up Grace Deaf Missions in Mexico. Keith and I were together at the NCT conference in Mexico City in March.

To the Carolinas (July 15-25)

I will be in both North and South Carolina at a variety of venues. I will be giving a seminar on the “Doctrines of Grace” at Integrity Church in Greenville, NC. I will also be getting caught up with Brad Woodlief, the IDS guy in Greenville.

To Romania (August 29-September 15)

I will be doing conferences in both Bucharest and Comanesti. At this time the topic of the conference in Bucharest is “The Practical Implications of New Covenant Theology.”


Saturday, June 18

Sabbath, Lord’s Day, and Worship in the New Covenant Era

The discussion group is from 8:00am to 10:00am at the home of Geoff Volker. Geoff Volker is going to be leading this discussion. All are invited to be a part on this theological discussion. If you desire to attend please notify Geoff Volker (geoff.volker@ids.org, 480.313.8558).

IDS Theological Discussion Group meets every other month on a Saturday morning at my place. The purpose of this group is two-fold.

#1  An opportunity for believers to be iron sharpening iron with one another so that we can make progress on our understanding of Scripture. Each meeting one individual leads an interactive discussion on a biblical topic that believers do not all agree on.

#2  To learn how to discuss biblical issues that we disagree on in a manner that honors the God of Scripture. 1 Corinthians 10:31


WHAT EVERY CHRISTIAN NEEDS TO KNOW ABOU THE QUR’AN, by James R. White, published by Bethany House, 2013, 310 pages, paperback. Amazon

The Reading Forum takes place from 8:00am to 10:00am on a Saturday at the home of Geoff Volker. Please contact Geoff if you have any questions.

480-313-8558, volker.geoff@gmail.com

Reading Schedule

Saturday, October 8                pages 9-104

Saturday, November 5            pages 105-192

Saturday, December 3            pages 193-287



IDS Hour

We just finished a two part series on “Imputation of the Active Obedience of Jesus.” You can also find me on sermonaudio.com. Just look under Geoff Volker.



IDS Hour

We just finished a two part series on “Imputation of the Active Obedience of Jesus.”


I would be more than happy to come to your home to conduct an Evening of Theology on the topic of your choice. You choose the topic and who you want to invite, provide a little finger 2-6or by email. There is no cost involved to bring me to your place to conduct the Evening of Theology. This is a tool to affect your family and friends for the Kingdom of God. Consider having one of these gatherings. Please contact Geoff Volker (480-313-8558, volker.geoff@gmail.com)  to schedule an Evening of Theology.


Picture/Fulfillment: A Study in New Covenant Theology

I am in the process of putting together a comprehensive book on New Covenant Theology. As I finish portions of the book I will be putting them out for your examination and comment. Please feel very free to comment on my writing and do not hesitate to criticize it. My desire is to have a book that is clear and comprehensive. I will begin sending out portions of the new book in June. Please send your comments to geoff.volker@ids.org.

I am currently working on one of the major sections that discusses the role of Israel in the plan of God. What I have written is now available for your comment on the IDS website. Please do not hesitate to give criticisms or suggestions. I am in need of your thoughts so that I can do a better job on this book. Go to www.ids.org and check out the “new book” section. Everyone who receives the IDS newsletter will also receive the new book portions, as they are available.


One of the most effective forms of ministry that I do is to meet with guys one on one. It is in this setting that I can tailor what we study to meet the needs of the one I am meeting with. If this appeals to you all you have to do is to let me know that you want to meet together. It can be a one-time meeting or an on-going commitment. In light of full disclosure you ought to know that I benefit more from these meetings than the person I am meeting with. Please contact me at 480-313-8558 or geoff.volker@ids.org.


The begging portion of this Newsletter

As always, financial support will not be refused if you should decide to give some to me. All you need to do is to make out a check to “IDS” and send it to the address of the ministry, IDS, P.O. Box 3482, Gilbert, AZ 85299. You can also send a check through the online banking of your bank. Personally I have found this method to be the most convenient way to support other ministries. Finally, you can give money by going to the IDS website (www.ids.org) and use the pay pal giving button. Please be aware that a portion of your gift through pay pal (2.5%) goes to pay pal. If you ever have questions regarding how we handle financial matters you only need to call or email me and I will answer all your questions.



The “New Covenant Confession of Faith” has been revised. Please check out this thorough confession of faith from the perspective of New Covenant Theology. We think that it is better than the original one. Look at it and give us your feedback. It would be greatly appreciated.


If you are looking for more times of teaching from me you could check out our churches website where the Sunday messages are available to you. http://ncbf.net. You can also check me out on sermonaudio.com. Look under Geoff Volker for messages delivered at New Covenant Bible Fellowship.

THEOLOGY 101 For Men Only, Scottsdale, Arizona (Dave Scholl’s home)

Book of Exodus

The Home of Dave Scholl

(5246 E. Fantol Dr., Paradise Valley, AZ 85253, Dave’s cell is 602.525.3469)

Please contact Geoff Volker (480.313.85558) for more information on this study. We meet at the man cave of Dave Scholl. The study normally meets on the 2nd Thursday of the month from 7:30am to 10:00am.

Future Meetings

Thursday, May 5 (Dave Scholl’s)

Thursday, June 9 (Dave Scholl’s)

Thursday, July 14 (Dave Scholl’s)

Thursday, August 11 (Dave Scholl’s)


In-Depth Studies is now in North and South Carolina. Our newest staff member Brad Woodlief makes his home is Greenville, NC. If you have interest in what we are doing in the Carolinas please contact Brad Woodlief, who would be more than happy to talk with you. Brad teaches bible studies in the Greenville area as well as equipping a students from East Carolina University. Brad would also love to meet with anyone who would want to be equipped with the tools to handle Scripture and is also available as a competent bible teacher for your church or group. Besides teaching You can contact Brad through email at Brad.Woodlief@gmail.com or through Skype at Brad.Woodlief. Please check out Brad’s blog (After Darkness, Light Shines, http://afterdarknesslightshines.blogspot.com).


Geoff Volker

Director of In-Depth Studies, volker.geoff@gmail.com, www.ids.org, www.ncbf.net

In-Depth Studies, PO Box 3482, Gilbert, AZ 85299

480.313.8558, Skype: “geoffvolker”

In-Depth Studies is a Theological Outreach of New Covenant Bible Fellowship, Mesa, Arizona, which seeks to equip the believer with a theological foundation from the point of view of the Doctrines of Grace and New Covenant Theology.

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