145. Experiencing an emotion is not, in itself, morally good or evil.140 The stirring of desire or repugnance is neither sinful nor blameworthy. What is morally good or evil is what we do on the basis of, or under the influence of, a given passion. But when passions are aroused or sought, and as a result we perform evil acts, the evil lies in the decision to fuel them and in the evil acts that result. Along the same lines, my being attracted to someone is not automatically good. If my attraction to that person makes me try to dominate him or her, them my feeling only serves my selfishness. To believe that we are good simply because "we feel good" is a tremendous illusion. There are those who feel themselves capable of great love only because they have a great need for affection, yet they prove incapable of the effort needed to bring happiness to others. They remain caught up in their own needs and desires. In such cases, emotions distract from the highest values and conceal a self-centredness that makes it impossible to develop a healthy and happy family life.
140 Cf. Thomas Aquinas, Summa Theologiae I-II, q. 24, art.1.
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