"Serenity of mind, gentleness, silence, self-control, purity of nature — this is called the austerity of mind."
Modern explanation
In the middle of the day, return to this: Calm is not a personality trait but a discipline. Tiny daily acts of restraint build it.
Practical application
Before responding to the thing irritating you, draft your reply, wait ten minutes, then re-read it.
Reflection question
What boundary is this anger asking me to set, calmly?