Depend upon it, it is better to learn how to live without being angry than to imagine one can moderate and control anger lawfully; and if through weakness and frailty one is overtaken by it, it is far better to put it away forcibly than to parley with it; for give anger ever so little way, and it will become master, like the serpent, who easily works in its body wherever it can once introduce its head. You will ask how to put away anger. My child, when you feel its first movements, collect yourself gently and seriously, not hastily or with impetuosity. Sometimes in a law court the officials who enforce quiet make more noise than those they affect to hush; and so, if you are impetuous in restraining your temper, you will throw your heart into worse confusion than before, and, amid the excitement, it will lose all self control.
...when we feel stirred with anger, we ought to call upon God for help, like the Apostles, when they were tossed about with wind and storm, and He is sure to say, “Peace, be still.” But even here I would again warn you, that your very prayers against the angry feelings which urge you should be gentle, calm, and without vehemence. Remember this rule in whatever remedies against anger you may seek. Further, directly you are conscious of an angry act, atone for the fault by some speedy act of meekness towards the person who
excited your anger. It is a sovereign cure for untruthfulness to unsay what you have falsely said at once on detecting yourself in falsehood; and so, too, it is a good remedy for anger to make immediate amends by some opposite act of meekness. There is an old saying, that fresh wounds are soonest closed.
St. Francis De Sales, Introduction To The Devout Life