 Disinterested scientific curiosity is a passion for an ordered intellectual vision of the connection of events. But the … intervention of action even in abstract science is often overlooked. No man of science wants merely to know. He acquires knowledge to appease his passion for discovery. He does not discover in order to know, he knows in order to discover. The pleasure which art and sciences can give to toil is the enjoyment which arises from successfully directed intention. (1929a: 74)