The third of the Six Perfections is perseverance, a quality that is especially important for people today. Śākyamuni Buddha was endowed with all the virtues and became the Buddha through his constant practice. Although it is a sin against him to emphasize only one of his virtues, the greatest virtue of the Buddha as a man seems to have been his generosity. No matter what biography of Śākyamuni Buddha we read or which of the sutras, we find that nowhere is it recorded that the Buddha ever became angry. However severely he was persecuted and however coldly his disciples turned against him and departed from him, he was always sympathetic and compassionate.
If I were asked to explain with a single phrase the character of Śākyamuni Buddha as a man, I would answer without hesitation, “A person of perfect generosity.” Therefore, I think that there is no action that makes Śākyamuni Buddha more sorrowful than when we become angry about something and reproach others or when we blame others for our own wrongs. Above all else, we should refrain from such actions toward each other. Perseverance is, in short, generosity. As we persevere in the practice of the bodhisattvas, we cease to become angry or reproachful toward others, or toward anything in the universe. We are apt to complain about the weather when it rains and to grumble about the dust when we have a spell of fine weather. However, when through perseverance we attain a calm and untroubled mind, we become thankful for both the rain and the sun. Then our minds become free from changes in our circumstances.
When we advance further, we come not only to have no feeling of anger and hatred toward those who hurt, insult, or betray us but even to wish actively to help them. On the other hand, we should not be swayed by flattery or praise of the good we may do but should quietly reflect on our conduct. We should not feel superior to others but should maintain a modest attitude when everything goes smoothly. All these attitudes come from perseverance. This mental state is the highest point of the practice of perseverance. Even though we cannot attain such a state of mind immediately, we can attain an attitude of compassion toward those who cause difficulties for us sooner than we expect. We ought to advance at least to this level. If this kind of perseverance were practiced by people throughout the world, this alone would establish peace and make mankind immeasurably happier.
Buddhism for Today, p36-37