John the Apostle
1 John 5:10BSB·traditional attribution

Whoever believes in the Son of God has this testimony within him; whoever does not believe God has made Him out to be a liar, because he has not believed in the testimony that God has given about His Son.

John Gill Reformed Baptist

The Spirit enlightens a man into his spiritual impotence and the completeness of Christ's blood and righteousness. Once a believer possesses this witness within himself, ten thousand artful arguments against Christ would signify nothing, he stands proof against them all.

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Jamieson-Fausset-Brown Reformed

God's Spirit dwelling in the believer witnesses that Jesus is Lord, the Christ, the Son of God. To deny this testimony is to charge God Himself with lying, a blasphemy that should startle anyone who truly grasps what it means.

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Geneva Bible Notes Reformed

Every conscience has this testimony in itself, and that conscience cannot be deceived because it agrees with the heavenly testimony the Father gives of His Son. To reject this agreement would make the Father Himself a liar.

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