"The things that we love tell us what we are."
"Man can sin against nature in two ways. First, when he sins against his specific rational nature, acting contrary to reason. In this sense, we can say that every sin is a sin against man's nature, because it is against man's right reason."
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Source: Saint Thomas (Aquinas), Peter Kreeft (1990). “A Summa of the Summa: The Essential Philosophical Passages of St. Thomas Aquinas' Summa Theologica”, p.41, Ignatius Press
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