Letters 39.3

Just as the flame springs straight into the air and cannot be cabined or kept down any more than it can repose in quiet, so our soul is always in motion, and the more ardent it is, the greater its motion and activity. But happy is the man who has given it this impulse toward better things! He will place himself beyond the jurisdiction of chance; he will wisely control prosperity; he will lessen adversity, and will despise what others hold in admiration.

Seneca, Letters to Lucilius 39.3, translated by Richard Mott Gummere