James Clerk Maxwell — "The greatest discovery ever made was the discovery of ignorance."

"But I think that the results which each man arrives at in his attempts to harmonize his science with his Christianity ought not to be regarded as having any significance except to the man himself, and…"

"The human mind is in a state of perpetual oscillation between the actual and the possible."

"The human mind is seldom satisfied, and is certainly never exercising its highest functions, when it is doing the work of a calculating machine."

"It is a good thing to have a great many ideas, and a great many of them bad."

"It is an unscientific habit to give names to things before we know what they are."