[3.] Having therefore everywhere excluded compulsion and pointing to (man’s) voluntary choice and free power, he has said the same now. For even in these mystical blessings, it is, on the one hand, God’s part, to give the grace, on the other, man’s to supply faith; and in after time there needs for what remains much earnestness. In order to preserve our purity, it is not sufficient for us merely to have been baptized and to have believed, but we must if we will continually enjoy this brightness, display a life worthy of it. This then is God’s work in us. To have been born the mystical Birth, and to have been cleansed from all our former sins, comes from Baptism; but to remain for the future pure, never again after this to admit any stain belongs to our own power and diligence. And this is the reason why he reminds us of the manner of the birth, and by comparison with fleshly pangs shows its excellence, when he says,