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 religion [ed. note: Husbands and wives have never been allowed to take monastic vows without mutual consent, see Bingham, book 7, ch 3; where also are incidentally given many instances of married persons thus giving up the world.], 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.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).