He who hath so believed the testimony of Christ, as to accept him, and to believe in him as his Saviour, hath, by that his believing, set to his seal that God, in all his promises of the Messiah under the Old Testament, is true; that a word hath not failed of whatsoever God hath there spoken of that nature. According to this is that 1 John 5:10, He that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. This saying doth notably commend faith, and defame unbelief. Faith in Christ as the only true Mediator and Saviour, giveth testimony to the truth of God, and sealeth it. Unbelief defames God, and doth in effect say that God is a liar.
Related Commentaries of John 3:33
John 3:33
33 He that hath received his testimony hath set to his seal that God is true.