5:10 {11} He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son.
(11) He proves the sureness of the earthly witness by every man's conscience having that testimony in itself, whose conscience he says cannot be deceived because it agrees with the heavenly testimony which the Father gives of the Son: for otherwise the Father must be a liar, if the conscience which agrees and assents to the Father, should lie.
5:10 He that believeth on the Son of God hath the witness in himself. He hath the witness in his changed heart and life.
He that believeth not God hath made him a liar. He makes God a liar by rejecting the witness God gives to the Son.
5:10 He that believeth on the Son of God hath the testimony - The dear evidence of this, in himself: he that believeth not God, in this, hath made him a liar; because he supposes that to be false which God has expressly testified.
5:9-12 Nothing can be more absurd than the conduct of those who doubt as to the truth of Christianity, while in the common affairs of life they do not hesitate to proceed on human testimony, and would deem any one out of his senses who declined to do so. The real Christian has seen his guilt and misery, and his need of such a Saviour. He has seen the suitableness of such a Saviour to all his spiritual wants and circumstances. He has found and felt the power of the word and doctrine of Christ, humbling, healing, quickening, and comforting his soul. He has a new disposition, and new delights, and is not the man that he formerly was. Yet he finds still a conflict with himself, with sin, with the flesh, the world, and wicked powers. But he finds such strength from faith in Christ, that he can overcome the world, and travel on towards a better. Such assurance has the gospel believer: he has a witness in himself, which puts the matter out of doubt with him, except in hours of darkness or conflict; but he cannot be argued out of his belief in the leading truths of the gospel. Here is what makes the unbeliever's sin so awful; the sin of unbelief. He gives God the lie; because he believes not the record that God gave of his Son. It is in vain for a man to plead that he believes the testimony of God in other things, while he rejects it in this. He that refuses to trust and honour Christ as the Son of God, who disdains to submit to his teaching as Prophet, to rely on his atonement and intercession as High Priest, or to obey him as King, is dead in sin, under condemnation; nor will any outward morality, learning, forms, notions, or confidences avail him.
