Catechism of the Catholic Church
1767 In themselves passions are neither good nor evil. They are morally qualified only to the extent that they effectively engage reason and will. Passions are said to be voluntary, "either because they are commanded by the will or because the will does not place obstacles in their way." 44 It belongs to the perfection of the moral or human good that the passions be governed by reason. 45
1768 Strong feelings are not decisive for the morality or the holiness of persons; they are simply the inexhaustible reservoir of images and affections in which the moral life is expressed. Passions are morally good when they contribute to a good action, evil in the opposite case. The upright will orders the movements of the senses it appropriates to the good and to beatitude; an evil will succumbs to disordered passions and exacerbates them. Emotions and feelings can be taken up into the virtues or perverted by the vices.
1769 In the Christian life, the Holy Spirit himself accomplishes his work by mobilizing the whole being, with all its sorrows, fears and sadness, as is visible in the Lord's agony and passion. In Christ human feelings are able to reach their consummation in charity and divine beatitude.
1770 Moral perfection consists in man's being moved to the good not by his will alone, but also by his sensitive appetite, as in the words of the psalm: "My heart and flesh sing for joy to the living God." 46
1771 The term "passions" refers to the affections or the feelings. By his emotions man intuits the good and suspects evil.
1772 The principal passions are love and hatred, desire and fear, joy, sadness, and anger.
1773 In the passions, as movements of the sensitive appetite, there is neither moral good nor evil. But insofar as they engage reason and will, there is moral good or evil in them.
1774 Emotions and feelings can be taken up in the virtues or perverted by the vices.
1775 The perfection of the moral good consists in man's being moved to the good not only by his will but also by his "heart."
English Translation of the Cathechism of the Catholic Church for the United States of America © 1997, United States Catholic Conference, Inc.