Complete adaptation to environment means death. The essential point in all response is the desire to control environment.

The notion that "applied" knowledge is somehow less worthy than "pure" knowledge, was natural to a society in which all useful work was performed by slaves and serfs, and in which industry was controlled by the models set by custom rather than by intelligence. Science, or the highest knowing, was then identified with pure theorizing, apart from all application in the uses of life; and knowledge relating to useful arts suffered the stigma attaching to the classes who engaged in them.

The development occurs through reciprocal give-and-take, the teacher taking but not being afraid also to give.

The young of human beings compare so poorly in original efficiency with the young of many of the lower animals, that even the powers needed for physical sustentation have to be acquired under tuition. How much more, then, is this the case with respect to all the technological, artistic, scientific, and moral achievements of humanity!

The only thing that is unqualifiedly given is the total pervasive quality; and the objection to calling it "given" is that the word suggests something to which it is given, mind or thought or consciousness or whatever, as well possibly as something that gives.

Even when a person is frightened by threats into doing something, the threats work only because the person has an instinct of fear. If he has not, or if, though having it, it is under his own control, the threat has no more influence upon him than light has in causing a person to see who has no eyes.

Every thinker puts some portion of an apparently stable world in peril.