tongue experiences sweet and bitter by taste, the eye distinguishes black from white by sight, and the ear perceives different sounds by hearing. Similarly, the mind acquires the knowledge of the good through the experience of both, and becomes more firmly committed to preserving it by obeying God. First, by penance, he rejects disobedience, because it is bitter and evil. Then he realizes what it really is—the opposite of goodness and sweetness, and so he is never tempted to taste disobedience to