Marcus Aurelius, Meditations: Book 4:33
So where should a man direct his endeavor? Here only — a right mind, action for the common good, speech incapable of lies, a disposition to welcome all that happens as necessary, intelligible, flowing from an equally intelligible spring of origins.
Themes
Marcus Aurelius was a Roman Emperor from 161 to 180 AD. He was the last of the Five Good Emperors, and is also considered one of the most important Stoic philosophers.