There is no saint without a past, no sinner without a future.

This is sometimes attributed to Augustine, but the earliest known occurrence is in Persian Rosary (c. 1929) by Ahmad Sohrab (PDF), which probably originates as a paraphrase of a statement in Oscar Wilde's 1893 play A Woman of No Importance: "The only difference between the saint and the sinner is that every saint has a past and every sinner has a future."