Yet I would not have the reader think this disputation of ours sufficient in a matter so arduous; for not every sin is spiritual fornication, nor does God destroy every sinner, for He hears His saints daily crying to Him, “Forgive us our debts;” but every man who goes a whoring and forsakes Him, him He destroys.
Whether this be the fornication for which divorce is allowed is a most knotty question - for it is no question at all that it is allowed for the fornication by carnal sin.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Retract., i, 19, 6