We know what befalls a man whose sense of taste suffers in an illness, how he ceases to have a true judgment of flavours and begins to loathe pleasantly-tasting things and to crave for what is loathsome. So it is with the man whose inclinations are corrupted from his conforming himself to the things of this world. He has no longer a true judgment where what is good for him is concerned. It is only the man whose inclinations are healthy and well directed, whose mind is made new again by grace, who can truly judge what is good and what is not.
--St. Thomas Aquinas, Meditations for Lent
