Letters 21.2

This is a mistake, Lucilius; to go from your present life into the other is a promotion. There is the same difference between these two lives as there is between mere brightness and real light; the latter has a definite source within itself, the other borrows its radiance; the one is called forth by an illumination coming from the outside, and anyone who stands between the source and the object immediately turns the latter into a dense shadow; but the other has a glow that comes from within.

It is your own studies that will make you shine and will render you eminent. Allow me to mention the case of Epicurus.

Seneca, Letters to Lucilius 21.2, translated by Richard Mott Gummere