All men on whom the Higher Nature has stamped the love of truth should especially concern themselves in laboring for posterity, in order that future generations may be enriched by their efforts, as they themselves were made rich by the efforts of generations past. For that man who is imbued with public teachings, but cares not to contribute something to the public good, is far in arrears of his duty, let him be assured; he is, indeed, not “a tree planted by the rivers of water that bringeth forth his fruit in his season,” [Psalms 1:3] but rather a destructive whirlpool, always engulfing, and never giving back what it has devoured.

— Dante Alighieri, De Monarchia, Ch. 1, 1312 (via)