Ambrose of Milan

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Or: John saw into the secrets of the heart; but let us remember by whose grace, for it is of the gift of God to reveal things to man, not of the virtue of man, which is assisted by the Divine blessing, rather than capable of perceiving by any natural power of its own. But quickly answering them, he proved that he was not the Christ, for his works were by visible operations. For as man is compounded of two natures, i. e. soul and body, the visible mystery is made holy by the visible, the invisible by the invisible; for by water the body is washed, by the Spirit the soul is cleansed of its stains. It is permitted to us also in the very water to have the sanctifying influence of the Deity breathed upon us. And therefore there was one baptism of repentance, another of grace. The latter was by both water and Spirit, the former by one only; the work of man is to bring forth repentance for his sin, it is the gift of God to pour in the grace of His mystery. Devoid therefore of all envy of Christ’s greatness, he declared not by word but by work that he was not the Christ. Hence it follows, There cometh after me one mightier than I. In those words, mightier than I, he makes no comparison, for there can be none between the Son of God and man, but because there are many mighty, no one is mightier but Christ. So far indeed was he from making comparison, that he adds, Whose shoes latchet I am not worthy to unloose.