Letters 59.18

Pleasure-lovers spend every night amid false-glittering joys, and just as if it were their last. But the joy which comes to the gods, and to those who imitate the gods, is not broken off, nor does it cease; but it would surely cease were it borrowed from without. Just because it is not in the power of another to bestow, neither is it subject to another’s whims. That which Fortune has not given, she cannot take away. Farewell.

Seneca, Letters to Lucilius 59.18, translated by Richard Mott Gummere