Letters 110.20

Your very porridge and water can fall under another’s jurisdiction; and besides, freedom comes, not to him over whom Fortune has slight power, but to him over whom she has no power at all. This is what I mean: you must crave nothing, if you would vie with Jupiter; for Jupiter craves nothing.”

This is what Attalus told us. If you are willing to think often of these things, you will strive not to seem happy, but to be happy, and, in addition, to seem happy to yourself rather than to others. Farewell.

Seneca, Letters to Lucilius 110.20, translated by Richard Mott Gummere