When angry, do not sin; do not ever let your wrath, your exasperation, your fury or indignation, last until the sun goes down.
Ephesians 4:26
Always shun whatever may makes you angry.
What is it that makes me angry?
Life is what it is; there are causes and effect, many of which I am not aware.
Do I rage against the tide and the moon? No.
I accept them as they are, knowing i cannot change them.
But neither can I change people.
So why rage at them — and at situations that are beyond my control?
There is a better choice. I can consider the circumstances a natural part of life that can be dealt with calmly and rationally; and I can then express my feelings in accordance with that view.
For today: To the extent that I can accept my own and others' shortcomings, I can be free of anger.

God, grant me the serenity to accept the things I cannot change, Courage to change the things I can, And wisdom to know the difference.