Tertullian

“ If you wish to imbibe to the utmost all knowledge of the apostle, in order to understand with what an axe of censorship he lops, and eradicates, and extirpates, every forest of lusts, for fear of permitting aught to regain strength and sprout again; behold him desiring souls to keep a fast from the legitimate fruit of nature—the apple, I mean, of marriage: “But with regard to what ye wrote, good it is for a man to have no contact with a woman; but, on account of fornication, let each one have his own wife: let husband to wife, and wife to husband, render what is due.” ”

“ Wherefore, if it is penalty which “burns,” it follows that fornication, which penalty awaits, is not pardonable. Meantime withal, while prohibiting divorce, he uses the Lord’s precept against adultery as an instrument for providing, in place of divorce, either perseverance in widowhood, or else a reconciliation of peace: inasmuch as “whoever shall have dismissed a wife (for any cause) except the cause of adultery, maketh her commit adultery; and he who marrieth one dismissed by a husband committeth adultery.” ”

“ But if he either has granted, or does grant, indulgence to fornication, of course he has frustrated the design of his own remedy. and will be bound forthwith to put the curb upon the nuptials of continence, if the fornication for the sake of which those nuptials are permitted shall cease to be feared. For (a fornication) which has indulgence granted it will not be feared. And yet he professes that he has granted the use of marriage “by way of indulgence, not of command.” [16] For he “wills” all to be on a level with himself. ”