Human beings, by change, renew, rejuvenate ourselves; otherwise we harden.
— Johann Wolfgang von Goethe

Have a heart that never hardens, and a temper that never tires, and a touch that never hurts.
Charles Dickens harden quote

Wealth and want equally harden the human heart, like frost and fire both are alien to human flesh.
— Theodore Parker

Spoon the sauce over the ice cream. It will harden. This is what you have been working for.
— Nicholson Baker

The hardened mass of liquid stones had much stronger qualities than those which had simply torn. The skin remained a recognisable part of the molten stone.
— Andy Goldsworthy