Do not take satisfaction in possessions and achievements that are not your own. If a horse were to say, “I am handsome,” his pride may be excusable. But if you boast, “I have a handsome horse,” you are claiming merit that is not yours.
What, then, is your own? The way you live your life. When you are living in harmony with nature, you can take just satisfaction.
The Manual (Enchiridion), Epictetus, the Sam Torode rewrite, Chapter 6
Just remember that you are not your horse. Judge your own actions. Your own thoughts. Those are the only things within your control.
Everything else? Outside of your control and if you take credit for it you’re lying to yourself and others.
And ultimately it’s the lying to self that is the most harmful.