Any person capable of angering you has just become your master
I live in the moment; I learn from my past and contemplate my future. I will not worry about things I do not have control over. It will not bother me. It shall not control me, I shall control myself. I will honor my virtues. I am Alpha, not Beta, I am the leader of myself!
There is no greater way to impress yourself than by practicing humility. First recognize you will not be the greatest and best at a certain activity. You will not be the richest and you will never reach the apex of financial wealth. The most important thing in your life are your virtues.
“If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.”
― Marcus Aurelius
“No school has more goodness and gentleness; none has more love for human beings, nor more attention to the common good. The goal which it assigns to us is to be useful, to help others, and to take care, not only of ourselves, but of everyone in general and of each one in particular.” — Seneca
“You get what you deserve. Instead of being a good person today, you choose instead to become one tomorrow.” —Marcus Aurelius
“Think of the life you have lived until now as over and, as a dead man, see what’s left as a bonus and live it according to Nature. Love the hand that fate deals you and play it as your own, for what could be more fitting?” – Marcus Aurelius
These are great and wonderful Stoic principals to keep in mind. You could call them rules but in Stoicism there really are not rules
It is a sin to pursue pleasure as a good and to avoid pain as a evil.