75. That in proportion as anyone shuns adultery, in the same proportion he loves marriage; or what is the same, in proportion as anyone shuns the lasciviousness of adultery, in the same proportion he loves the chastity of marriage, is because the lasciviousness of adultery and the chastity of marriage are two opposite things, and therefore in proportion as anyone is not in the one, he is in the other. It is precisely as has been said above at n. 70.