It is merely a linguistic peculiarity, not a logical fact, that we say "that is red" instead of "that reddens," either in the sense of growing, becoming, red, or in the sense of making something else red.

Old ideas give way slowly; for they are more than abstract logical forms and categories. They are habits, predispositions, deeply ingrained attitudes of aversion and preference.

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

The only way to abolish war is to make peace seem heroic.

Experience alone cannot deliver to us necessary truths; truths completely demonstrated by reason. Its conclusions are particular, not universal.

Schools should take an active part in directing social change, and share in the construction of a new social order

One of the saddest things about US education is that the wisdom of our most successful teachers is lost to the profession when they retire.