Letters 17.8

It is indeed so. After you have come to possess all other things, shall you then wish to possess wisdom also? Is philosophy to be the last requisite in life,—a sort of supplement? Nay, your plan should be this: be a philosopher now, whether you have anything or not,—for if you have anything, how do you know that you have not too much already?—but if you have nothing, seek understanding first, before anything else.

Seneca, Letters to Lucilius 17.8, translated by Richard Mott Gummere