In his treatise, Concerning Perfection according to the Saviour, he writes, “Consent indeed fits for prayer, but fellowship in corruption weakens supplication. At any rate, by the permission he certainly, though delicately, forbids; for while he permits them to return to the same on account of Satan and incontinence, he exhibits a man who will attempt to serve two masters— God by the 'consent', but by want of consent, incontinence, fornication, and the devil.”— Clem. Alex.: Strom., iii. c. 12.
Source: Fragments (New Advent)