A.W. Tozer emphasizes the sufficiency of Christ in his sermon 'Walking in the Light of His Presence', criticizing the tendency to seek validation of Christ through psychology, philosophy, and science. He points out the absurdity of modern believers seeking approval from worldly figures, while the New Testament clearly states that God commands repentance through Christ, who has been validated by His resurrection. Tozer asserts that Christ does not need external validation; He is self-validating as the Second person of the Godhead, and every individual ultimately stands before Him for judgment. The resurrection of Christ serves as the ultimate assurance of His identity and authority.

Our frantic and futile effort to harmonize the truth of Christ with psychology, philosophy and science is proof enough of a deep incertitude among us concerning the sufficiency of Christ. It is a tragicomic sight to see our modern apostles licking the palm of any man of learning who will condescend to say something complimentary about Jesus Christ. How eagerly we rush into print with any quotation from the lips of the Great Man of the world that can be tortured into an admission that he believes that Jesus is the Son of God. The New Testament points to Christ and says God now commands all men everywhere to repent: because He has appointed a day, in which He will judge the world in righteousness by that Man whom He has ordained; whereof He has given assurance unto all men, in that He has raised Him from the dead. God validated forever the claims of Christ. He is who He said He was and what He said He was. Christ stands before no man to be judged, but every man stands before Him. Any uncertainty about Him was swept away forever when He arose from the dead, ascended into heaven and sent down the Holy Spirit as His final witness among men. Now it may be said that Christ as the Second person of the Godhead is self-validating. He needs no supplementary witness from the world of nature or from the race of men. He is His own witness.