Sometimes those who are dogmatic in rejecting trichotomy imply that the view of man as spirit, soul, and body is naive or symptomatic of a lack of higher education.
Consider Dr. Ken Boa, President of Reflections Ministries.
“Kenneth (Ken) Boa is engaged in a ministry of relational evangelism and discipleship, teaching, writing, and speaking. He holds a BS from Case Institute of Technology, a ThM from Dallas Theological Seminary, a PhD from New York University, and a DPhil from the University of Oxford in England. He leads four weekly Bible studies in the Atlanta area, including two men’s fellowships and one at Christ Church of Atlanta.”[1]
In his exposition of Colossians, he teaches on “The New Self” in chapter 3.
In minutes 13-17 Dr. Boa explains the new self with the illustration from Hebrews 4:12. What the marrow is to the bone, the human spirit is to the soul. He agrees with the ontological distinction of spirit and soul.
Dr. Boa is the author of a dozen books, including Conformed to His Image: Biblical and Practical Approaches to Spiritual Formation (Zondervan).
Biblical Psychology 