Sin And Repentance

Μὴ ἀφῇς ἀνεξάλειπτον ἁμαρτίαν, κἂν βραχυτάτη τυγχάνῃ, ἵνα μὴ ὕστερον ἐπὶ μεῖζον κακὸν κατασύρῃ σε. Ἅγιος Μάρκος ὁ Ἐρημίτης, Περὶ Νόμου Πνευματικοῦ Source: Migne PG 65.921a-b

Do not dismiss a sin unrepented, for though things may go well for a little while, it will not be long before it drags you down into greater evil. Saint Mark The Ascetic, On The Spiritual Law.