Tertullian

“ Quote, then, one nation which is free from the passions which allure the whole race of men to incest! If there is a single nation which knows nothing of concubinage through the necessity of age and sex—to say nothing of lust and licentiousness—that nation will be a stranger to incest. If any nature can be found so peculiarly removed from the human state as to be liable neither to ignorance, nor error, nor misfortune, that alone may be adduced with any consistency as an answer to the Christians. ”

“ When their wickedness becomes manifest, the parents find a remedy for their despair by hanging themselves; to their son, who survives the miserable calamity, their property is awarded by the prefect, not as an inheritance, but as the wages of infamy and incest. ”

“ As for your incestuous deeds, on the contrary, [3] men enjoy them at full liberty, in the face of day, or in the natural night, or before high Heaven; and in proportion to their successful issue is your own ignorance of the result, since you publicly indulge in your incestuous intercourse in the full cognizance of broad day-light. (No ignorance, however, conceals our conduct from our eyes,) for in the very darkness we are able to recognise our own misdeeds. ”