A quote
“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·Letter 85 — On Some Vain Syllogisms (§2)·trans. Gummere