Sin creates a proclivity to sin ; it engenders vice by repetition of the same acts.
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Paragraph 1865
1865. Sin creates a proclivity to sin; it engenders vice by repetition of the same acts. This results in perverse inclinations which cloud conscience and corrupt the concrete judgment of good and evil. Thus sin tends to reproduce itself and reinforce itself, but it cannot destroy the moral sense at its root.
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1876. The repetition of sins - even venial ones - engenders vices, among which are the capital sins.
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