18 We know that whosoever is born of God sinneth not; but he that is begotten of God keepeth himself, and that wicked one toucheth him not.
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Can you imagine a common man (not the Son of Man), who would not sin? The great saints talked about themselves as of great sinners. And the apostle John speaks here about "sinfulness" as something completely known: "we know..."
Probably, the solution of this paradox, as in several situations of the spiritual life, lies in the formula of four words: "already yes, no yet". Birth of God, as salvation, quite as entrance into the Kingdom, is a dynamic notion, it is not fulfilled, but is fulfilling in us, and in proportion to this fulfillment we go away from sin, because we preserve ourselves from evil, and the deceitful which in us does not have what "to hang on ".