“In  marriage, however, let the blessings of marriage be loved: offspring,  fidelity, and the sacramental bond. Offspring, not so much because it  may be born, but because it can be reborn; for it is born to punishment  unless it be reborn to life. Fidelity, but not such as even the  unbelievers have among themselves, ardent as they are for the flesh. . .  . The sacramental bond, which they lose neither through separation nor  through adultery, this the spouses should guard chastely and  harmoniously.”–St. Augustine (Marriage and Concupiscence 1:17:19 [A.D. 419])