Definition 
Biblical Counseling is the process where the Bible, God’s Word, is related individually to a person or persons who are struggling under the weight of personal sin and/or the difficulties with suffering, so that he or she might genuinely change in the inner person to be pleasing to God. 

Three Key Beliefs 
First, we believe that the Bible, given by God, is sufficient for life in that, when properly interpreted, it reveals to the believer all the data necessary for one to understand his need for Christ, how he can please the Lord, and how to live in a God-honoring way regardless of the circumstances whether comfortable or oppressive. 

Second, the Bible is also the authoritative source with which all truth claims—including claims made by science and history—must be evaluated. As a result, we reject all counseling theories that use presuppositions, principles, and/or methodologies that are inconsistent with the proper interpretation of the biblical text. 

Third, we believe that genuine heart change is totally dependent on the ministry of the Holy Spirit. Thus, our view of counseling practice includes the importance of prayer, dependence on God, a thorough knowledge of the Word of God, and an understanding of ministering to people.   

Quoted from https://www.faithlafayette.org/counseling/what-is-biblical-counseling