Tertullian

“ Go on, if you succeed in finding power and will, while you are so secure, and as it were upon solid ground. For if any wavering of the flesh, any distraction of the mind, any wandering of the eye, shall chance to shake you down from your equipoise, “God is good.” To His own (children) , not to heathens, He opens His bosom: a second repentance will await you; you will again, from being an adulterer, be a Christian! ”

“ Hence the remedies are unintelligible to such to whom the perils themselves are unintelligible: whereas the principle of repentance finds there its corresponding place where sin is committed with conscience and will, where both the fault and the favour are intelligible; that he who mourns, he who prostrates himself, is he who knows both what he has lost and what he will recover if he makes to God the offering of his repentance—to God who, of course, offers that repentance rather to sons than to strangers. ”

“ It is enough for me that even John, when “strewing the Lord’s ways,” [2] was the herald of repentance no less to such as were on military service and to publicans, than to the sons of Abraham. [3] The Lord Himself presumed repentance on the part of the Sidonians and Tyrians if they had seen the evidences of His “miracles.” [4]
Nay, but I will even contend that repentance is more competent to natural sinners than to voluntary. For he will merit its fruit who has not yet used more than he who has already withal abused it ”