If you meet temptation, use self-control; if you meet pain, use fortitude; if you meet revulsion, use patience. - Epictetus

Si alguien te hiciere saber que un inviduo habla mal de ti, no te defiendas, ni refutes lo que haya dicho, sino que responde: «Aquel que ha dicho aquello de mí, ignora sin duda otros defectos, de lo contrario no habría dicho sólo estos.»

Let others behave as they will — that is not within your control anyway, and thus it’s of no concern to you. Understand that nature as a whole is ordered according to reason, but that not everything in nature is reasonable.

When you are feeling upset, angry, or sad, don’t blame another for your state of mind. Your condition is the result of your own opinions and interpretations.