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.

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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

Smile! A New Way to Give.

We found an effortless way to support In-Depth Studies and would love to share it with you. Amazon.com has a program called Smile, accessible at Smile.Amazon.com. It’s simple: You choose your favorite 501(c)3 (IDS, of course!), and for every purchase you make at Smile.Amazon.com Amazon gives a portion of its proceeds to the non-profit of your choice.

Ready to start giving with Smile? Here’s how:

  1. Go to Smile.Amazon.com and type “New Covenant Bible Fellowship” into the search bar. Continue with the Search button. Note: In-Depth Studies is registered under the New Covenant Bible Fellowship 501(c)3. Don’t worry, your support will get to us!
    Smile12. Find the listing for the Mesa, AZ New Covenant Bible Fellowship and pick it with the Select button.


3. Finally, check the box to agree that you’ll go to Smile.Amazon.com to support In-Depth Studies when you shop on Amazon (we won’t get any credit if you shop at the main Amazon.com, even though the items sold on the Smile site are identical to the main site)Smile3

That’s it! All you have to do now is shop at Smile! We appreciate your ongoing support for the IDS ministry.

  1. IDS Newsletter, May 2016 Leave a reply
  2. IDS Hour – Imputation of Active Obedience: Episode 2 Leave a reply
  3. IDS Hour – Imputation of Active Obedience: Episode 1 Leave a reply
  4. IDS Newsletter, April 2016 Leave a reply
  5. IDS Hour – NCT Discussion with David Gay: Episode 2 Leave a reply
  6. IDS Newsletter, March 2016 Leave a reply
  7. IDS Hour – NCT Discussion with David Gay: Episode 1 Leave a reply
  8. IDS Hour – Faith and Works: Episode 2 Leave a reply
  9. IDS Newsletter, February 2016 Leave a reply