“Whenever we pride ourselves upon finding a newer, stricter way of thought or exposition; whenever we start insisting too hard upon "operationalism" or symbolic logic or any other of these very essential systems of tramlines, we lose something of the ability to think new thoughts. And equally, of course, whenever we rebel against the sterile rigidity of formal thought and exposition and let our ideas run wild, we likewise lose. As I see it, the advances in scientific thought come from a combination of loose and strict thinking, and this combination is the most precious tool of science.”

Gregory Bateson (1935) "Culture Contact and Schismogenesis" in: Man, Vol. 35 (Dec., 1935), pp. 178-183. Republished in: Steps to an Ecology of Mind (1972, p. 75)