Join Grant Castleberry as he welcomes Dr. Keith Mathison, theologian, author, and the inaugural R.C. Sproul Chair of Systematic Theology at Reformation Bible College, for a fascinating conversation on the life, legacy, and theological influence of Dr. R.C. Sproul. Dr. Mathison shares his own journey to faith, his years of working alongside Sproul, and the providential path that led him from Texas to Ligonier Ministries and Reformation Bible College.

The conversation explores Sproul's lasting impact on the resurgence of Reformed theology, his remarkable gifts as a teacher and communicator, and his passion for equipping ordinary Christians with sound doctrine. Grant and Keith also take a deep dive into classical apologetics, discussing how Christians can defend the faith with both biblical fidelity and intellectual rigor.

Topics include the existence of God, the authority of Scripture, the role of miracles, the relationship between faith and reason, and how believers can answer the moral and philosophical objections raised by today's culture.

Whether you've benefited from R.C. Sproul's ministry for decades or are just discovering his work, this episode offers a compelling look at one of the most influential theologians of the last century while equipping Christians to confidently proclaim and defend the truth of the gospel.

Watch the interview by visiting our YouTube Channel.

In this episode of the Unashamed Truth Podcast, Grant Castleberry is joined by Dr. John Tweeddale, Vice President and Professor of Theology at Reformation Bible College, to explore the remarkable life and ministry of James Montgomery Boice. Though often overlooked today, Boice helped shape modern Reformed evangelicalism through his unwavering commitment to biblical authority, expository preaching, and confessional theology.

Together they discuss Boice's ministry at Tenth Presbyterian Church, his influence on leaders such as R.C. Sproul, John MacArthur, John Piper, and Tim Keller, his leadership in the Chicago Statement on Biblical Inerrancy, and his role in founding the Philadelphia Conference on Reformed Theology. Along the way, they reflect on Boice's preaching, his passion for mentoring younger pastors, and why his example remains so needed for the church today.

Whether you're a pastor, ministry leader, or simply want to learn from one of the most influential yet underappreciated figures of the twentieth century, this conversation will encourage you to stand firmly on the authority of God's Word and faithfully proclaim Christ to the next generation.

Watch this episode on our YouTube Channel.

What does true repentance really look like? Is repentance simply something that happens at conversion, or is it the pattern of the entire Christian life?

In this episode, Grant Castleberry is joined by theologian and pastor Harrison Perkins to discuss the biblical doctrine of repentance. Together they explore the relationship between repentance and faith, why repentance is a gracious gift rather than a burden, how Christians fight ongoing sin, and why the Reformers and Puritans considered repentance essential to spiritual growth. Drawing from Scripture, church history, and pastoral ministry, this conversation offers practical encouragement for every believer seeking to follow Christ with greater holiness and hope.

Watch the episode by visiting our YouTube Channel.