Think of your many years of procrastination; how the gods have repeatedly granted you further periods of grace, of which you have taken no advantage. It is time now to realize the nature of the universe to which you belong, and of that controlling Power whose offspring you are; and to understand that your time has a limit set to it. Use it, then, to advance your enlightenment; or it will be gone, and never in your power again.

— Marcus Aurelius, Meditations, p. 46

"People are usually more firmly convinced that their opinions are precious than that they are true." — George Santayana