Letters 90.2

For if they had made philosophy also a general good, and if we were gifted with understanding at our birth, wisdom would have lost her best attribute—that she is not one of the gifts of fortune. For as it is, the precious and noble characteristic of wisdom is that she does not advance to meet us, that each man is indebted to himself for her, and that we do not seek her at the hands of others.

What would there be in philosophy worthy of your respect, if she were a thing that came by bounty?

Seneca, Letters to Lucilius 90.2, translated by Richard Mott Gummere