464. (2) Taking a mistress in conjunction with the wife is forbidden to Christians and abhorrent. It is forbidden because it is in violation of the marriage covenant, and it is abhorrent because it is in violation of religion; and anything that is in violation of the one and the other at the same time is in violation of the Lord. Therefore, as soon as anyone takes a mistress in addition to his wife without a real weighty cause, heaven is closed to him, and the angels no longer number him among Christians. From that time on he also scorns things having to do with the church and religion, and thereafter does not raise his eyes above nature, but turns to it as to a deity that sanctions his lust, the influx of which then moves his spirit. The inner reason for this apostasy will be disclosed in the considerations that follow. The man himself who takes a mistress in such a circumstance does not see that it is abhorrent, because with the closing of heaven comes spiritual insanity. But a chaste wife sees it clearly, because she is the embodiment of conjugial love, and this love is revolted by such an action. For that reason, too, many of them subsequently refuse physical union with their husbands, as something that would contaminate their chastity by a contagious communication of the lust clinging to the husbands from their harlots.