Letters 48.12

Therefore, my dear Lucilius, withdraw yourself as far as possible from these exceptions and objections of so-called philosophers. Frankness, and simplicity beseem true goodness. Even if there were many years left to you, you would have had to spend them frugally in order to have enough for the necessary things; but as it is, when your time is so scant, what madness it is to learn superfluous things! Farewell.

Seneca, Letters to Lucilius 48.12, translated by Richard Mott Gummere