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The quote is from Ven. Louis da Ponte (not Ven. Leo Dupont):
"I have committed many faults, but I have never made peace with my faults. Many make peace with their defects, and this shall cause their ruin."
A reference to this is made by St. Alphonsus Liguori in his book Dignity and Duties of the Priest page 103:
The Venerable Louis da Ponte used to say: "I have committed many faults, but I have never made peace with my faults. Many make peace with their defects, and this shall cause their ruin."