Whosoever abides in him sins not: whosoever sins has not seen him, neither known him.
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Augustine of Hippo
AD 430
In so far as he abides in Him, in so far sins not. Whosoever sins has not seen Him, neither known Him. A great question this: Whosoever sins has not seen Him, neither known Him. No marvel. We have not seen Him, but are to see; have not known Him, but are to know: we believe in One we have not known. Or haply, by faith we have known, and by actual beholding have not yet known? But then in faith we have both seen and known. For if faith does not yet see, why are we said to have been enlightened? There is an enlightening by faith, and an enlightening by sight. At present, while we are on pilgrimage, we walk by faith, not by sight, 2 Corinthians 5:7 or, actually beholding. Therefore also our righteousness is by faith, not by sight. Our righteousness shall be perfect, when we shall see by actual beholding. Only, in the meanwhile, let us not leave that righteousness which is of faith, since the just does live by faith, Romans 1:17 as says the apostle. Whosoever abides in Him, sins not. For, ...
Whosoever abides in him, complying with his law, sins not; and whosoever sins, has not seen him, nor known him; that is, with such a knowledge as is joined with love.