What is the scale of perfection, or maturity, modeled in Isaiah 6?

Jerry Root is a Professor of Evangelism and Leadership at Wheaton College and serves as the Director of the Evangelism Initiative. Jerry is a graduate of Whittier College and Talbot Graduate School of Theology at Biola University; he received his PhD from the Open University. Jerry is the author or co-author of numerous books on C.S. Lewis, including The Surprising Imagination of C.S. Lewis: An Introduction, with Mark Neal, C.S. Lewis and a Problem of Evil: An Investigation of a Pervasive Theme, and The Soul of C.S. Lewis: A Meditative Journey through Twenty-six of His Best Loved Writings. In addition, Jerry has been a visiting professor at Talbot Graduate School of Theology and Biola University from 1990 to the present. Here, Jerry answers questions from the talk "Spiritual Formation: What Does It Mean to Grow in Christ?", given at the 2024 European Leadership Forum.