QUOTATION: The Results of Sin

Since the aptness for grace is part of human nature’s good estate, we can now appreciate how sin diminishes nature. And because grace perfects nature, heightening mind and will and the sensitive parts which serve reason, we can appreciate also how sin, by depriving us of grace and clogging our natural abilities, also hurts nature. The results of sin are ignorance, malice, and concupiscence, and these are called the wounds of nature.

--St. Thomas Aquinas, Disputations Concerning Evil, 11, 11.