Anger, except when it is an holy emotion directed against an unholy thing, is a cause of both sin and suffering, and unless we have attained considerably to the wisdom and stature of perfect men in Christ, we can seldom take this fire of anger in our bosom without burning thereby ourselves or our neighbours. Let anyone who tries to crucify the flesh, and to please God, look into his own experience, and he will find that the less he has felt of anger the better it has been for the peace of his conscience and the usefulness of his life. The holy may use anger against sin in the world, but it is too sharp a weapon for the handling of most of us, even in this case. The best practical treatment of anger against others is to defer it. A wise man, though he experiences the heat, will do nothing till he cools again. He will thus both follow the safe course, and be in a better state to form a righteous judgment as to what offends him. But the best specific against anger, either as a sin or a suffering, is looking unto Jesus. Its dangerous and tormenting flame, when kindled in our hearts, may best be extinguished by letting in upon it a measure of that charity wherewith he loved us. Let us call to mind His own most precious prayer: I have made known to them Thy name, and will make it known, that the love wherewith Thou has loved me, may be in them, and I in them. If we abide in Him sinful anger will be kept down or cast out, and what remains, being like His own, will neither trouble ourselves, nor hurt others.
- text taken from Daily Bread - Bring a Few Morning Meditations for the Use of Catholic Christians by Father Richard Waldo Sibthorp