De Decalogo

And it would be a less grievous evil if this hatred were displayed without disguise; for it is easiest to guard against what is plainly seen. But at present it is with difficulty suspected, and difficult of detection, being concealed by cunning and wicked arts, and at times it assumes the contrary appearance of love and affection, by means of its trickery and deceit.

Accordingly, adultery exhibits the destruction of three houses by its means; that of the house of the man who sustains the violation of all the vows which were made to him at his marriage, and the loss of all the hopes of legitimate children, of which he is now deprived; and two others, namely, the house of the adulterer, and that of his wife. For each of these is filled with insolence, and dishonour, and the most excessive disgrace.