Mark 10:11

(Vict. Ant. e Cat. in Marc.) The Lord calls by the name of adultery cohabitation with her who is not a man's wife; she is not, however, a wife, whom a man has taken to him, after quitting his first; and for this reason he commits adultery upon her, that is, upon the second, whom he brings in. And the same thing is true in the case of the woman; wherefore it goes on, And if a woman shall put away her husband, and marry another, she committeth adultery; for she cannot be joined to another as her own husband, if she leave him who is really her own husband. The law indeed forbade what was plainly adultery; but the Saviour forbids this, which was neither plain, nor known to all, though it was contrary to nature.

(ubi sup.) In Matthew it is more fully expressed, Whosoever shall put away his wife, except it be for fornication. (Matt. 19:9.) The only carnal cause then is fornication; the only spiritual cause is the fear of God, that a man should put away his wife to enter into religiono, as we read that many have done. But there is no cause allowed by the law of God for marrying another, during the lifetime of her who is quitted.

(non occ.) For a repetition of a saying of the Word, produces not weariness, but thirst and hunger; (Ecclus. 24:29) wherefore it is said, They that eat me shall yet be hungry, and they that drink me shall yet be thirsty; for the tasting of the honied words of wisdom yields all manner of savour to them who love her. Wherefore the Lord instructs His disciples over again; for it goes on, And he saith unto them, Whosoever shall put away his wife and marry another, committeth adultery upon her.