Letters 85.2

“He that possesses prudence is also self-restrained; he that possesses self-restraint is also unwavering; he that is unwavering is unperturbed; he that is unperturbed is free from sadness; he that is free from sadness is happy. Therefore, the prudent man is happy, and prudence is sufficient to constitute the happy life.”

Seneca, Letters to Lucilius 85.2, translated by Richard Mott Gummere