We are like a man running downhill, who cannot keep on his legs unless he runs on, and will inevitably fall if he stops; or, again, like a pole balanced on the tip of one’s finger; or like a planet, which would fall into its sun the moment it ceased to hurry forward on its way. Unrest is the mark of existence.
Arthur Schopenhauer, Studies in Pessimism (via ihatenietzsche)