The discretion of a man deferreth his anger; and it is his glory to pass over a transgression. (Proverbs 19:11)
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Rabbi Menachem Meiri relates the following story:
There was once a righteous king who had but one major fault; he was angered very easily. To overcome this tendency he wrote three lines on a sheet of paper and appointed one of his servants to show it to him whenever he started to grow angry.
The lines read:
1. Always remember that you are merely a creature, and you yourself are not the Creator.
2. Always remember that you are flesh and blood and will eventually perish.
3. Always remember that there will be mercy for you in the future only if you have mercy on others.
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– Tom Irvine