Verse 10.— He that believeth on the Son of God. Every man who is brought to believe on the Son of God has the witness in himself. In this he knows that a change occasioned by that belief has taken place in his own heart, life and conduct. One who disbelieves what God has declared concerning his Son, thereby rejects his testimony and regards God as a liar, or attempts to make God a liar by his rejection of his testimony.