"If you work at that which is before you, following right reason seriously, vigorously, calmly, without allowing anything else to distract you...if you hold to this, expecting nothing, but satisfied to live now according to nature, speaking heroic truth in every word which you utter, you will live happy. And there is no man able to prevent this."
- Marcus Aurelius, 2nd-century Roman emperor and Stoic philosopher, from his Meditations