There is only one way to happiness and that is to cease worrying about things which are beyond the power of our will.Epictetus
“Circumstances don't make the man, they only reveal him to himself.”
Stoic philosopher · 50 – 135
Epictetus was a Greek-born slave in Rome who won his freedom and became one of the most influential Stoic teachers. His Discourses and the handbook known as the Enchiridion teach that freedom lies in mastering one's own judgments and desires.
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No man is free who is not master of himself.Epictetus

Whoever does not regard what he has as most ample wealth, is unhappy, though he be master of the world.Epictetus
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Don't explain your philosophy. Embody it.Epictetus