John 8:46

Which of you convinceth me of sin? — He appeals to their knowledge of His sinless life, as in John 8:29. He asserted His own knowledge of entire conformity to His Father’s will. It is an appeal that spotless purity alone could make, and is His own testimony uttered in the dignity of certain knowledge. (Comp. John 14:30.)

If I say the truth, why do ye not believe me? — We may suppose that the last question was probably followed by a pause, during which any one might have answered the challenge. No one of all who had watched Him in Galilee and Judæa dared utter a syllable. Their silence is the seal to His own testimony. But if He is thought of by these as without sin, they cannot think of His words as untrue. They admit, then, that He speaks the truth, and yet they do not believe. On the absolute sinlessness of Christ, comp. 1 John 3:5; 2 Corinthians 5:21; 1 Peter 1:19; 1 Peter 1:22.