Philip of Macedon

“The more we value things outside our control, the less control we have.”
― Epictetus, Discourses and Selected Writings

“Concentrate every minute like a Roman— like a man— on doing what’s in front of you with precise and genuine seriousness, tenderly, willingly, with justice. And on freeing yourself from all other distractions. Yes, you can— if you do everything as if it were the last thing you were doing in your life, and stop being aimless, stop letting your emotions override what your mind tells you, stop being hypocritical, self-centered , irritable. You see how few things you have to do to live a satisfying and reverent life? If you can manage this, that’s all even the gods can ask of you.”
― Marcus Aurelius, Meditations

“The things you think about determine the quality of your mind.”
― Marcus Aurelius, Meditations

“At the time, science had declared humans unique, since we were so much better at identifying faces than any other primate. No one seemed bothered by the fact that other primates had been tested mostly on human faces rather than those of their own kind.”
― Frans de Waal, Are We Smart Enough to Know How Smart Animals Are?