“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) http://magshare.net/narchive/NArchive/Misc/Raw_Data/A_Persian_Rosary_by_Mirza_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."
Misattributed
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Aurelius Augustinus 183
early Christian theologian and philosopher 354–430Related quotes

“Every saint has a past, and every sinner has a future.”

“Every saint has a past. Every sinner has a future.”

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"On Sir John A. Macdonald" Toronto Star (October 9, 1964)