This is bound to offend many but I thought I would throw it out there.

Certainly, Scripture does not claim to be a thorough textbook on medicine, or physics, or any of the sciences. But psychology differs from these in two important regards. First, psychology is not a true science…. Second, and most significant, psychology, unlike medicine and physics, deals with matters that are fundamentally spiritual. In fact, the word psychology literally means, “study of the soul.” What are the deep psychological needs if they are not the spiritual issues the gospel is concerned with? And Scripture certainly does claim absolute sufficiency in addressing those needs: “All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness; that the man of God may be adequate, equipped for every good work” (2 Tim. 3:16-17, emphasis added). “The law of the Lord is perfect, restoring the soul” (Ps. 19:7). Scripture itself promises believers the most comprehensive spiritual resources: “everything pertaining to life and godliness” (2 Pet. 1:3).

–John MacArthur

In other words, while the Bible was never intended to be a textbook for disciplines such as math or physics, it does claim to be an all-sufficient guide for godly living. Therefore, if the goal of Christian counseling is godliness in the life of the counselee, the counselor need not look beyond the wisdom found in the pages of Scripture to be equipped for his task. For if the counselee’s problem is spiritual in nature, Scripture is sufficient to meet the demand. On the other hand, if the problem is the inability to bake tasty muffins, a cookbook might be a better place to look.

–Matt Waymeyer

From:
2+2=4 and the Sufficiency of Scripture

Jay Adams is an author of books that deal with true Christian counseling. If you look at the table of contents (PDF file) of his book A Theology of Christian Counseling among others you’ll find that it’s about spritual maturity through Biblical principles.