120. The irascible passions are explained as follows: (a) hope reaches out towards a future good whose attainment is difficult, but not impossible; despair turns away from a good that seems impossible of attainment; (b) bravery goes out to attack an evil that seems difficult and imminent, but not unconquerable; fear falls back before a future difficulty that seems irresistible; (e) anger is the desire of vengeance for an injury received. 121. Moral Value of the Passions.--The Stoics held that all the passions are diseases of the soul, and that one is perfect when one arrives at the condition of being passionless or apathetic. Lucretius, on the contrary, taught that all the impulses of passion are good. The truth is that the passions are good or evil according to the way they are considered. (a) Physically, the passions are good, since they are the acts of natural powers, or the perfection and complement of something good in itself. (b) Morally, they are indifferent, if they are viewed in themselves, as the product of the sensitive appetite. For this appetite is an irrational power of the soul, similar to that of the beasts, and acts are not moral unless rational--i.e., an act is good or evil only from its relation to reason. (c) Morally, the passions are good or bad, if commanded by reason and will, for thus they partake of the good or evil that is in the acts from which they proceed, just as the acts of the external members of the body are moral in so far as they execute the commands of the will. The passions are voluntary if commanded by the will, or not forbidden by it. Examples: Our Lord looked about Him with anger, being grieved at the blindness of His enemies who watched Him in the synagogue (Mark, iii. 5); He wept over the destruction of Jerusalem (Luke, xix. 41); He was sad at the approach of His passion (Mark, xiv. 34). 122. The passions are morally good: (a) if they are directed by the will to a morally good object; for example, shame is a praiseworthy passion, because it is fear of what is dishonorable, and pity is also good, because it is according to right reason, being sorrow for the misfortune of another; (b) if they are chosen by the reason for a good purpose; for example, it is good to excite the emotion of joy that one may pray with greater fervor, or to arouse the feelings of pity, fear, or hope, in order that one may be more earnestly moved to acts of mercy, repentance, courage; (c) if the circumstances are moderated according to right reason; for example, to grieve over the death of a friend excessively, so that one is unfitted for duty and suffers in health, is unreasonable; but to grieve even unto tears, as Christ did at the tomb of Lazarus, is an act of piety. Similarly, the slight anger of Heli was blamable and the great anger of Moses was laudable, because the evils in both instances called for severity (I Kings, ii, iii; Exod., iii).