Teaching can be compared to selling commodities. No one can sell unless someone buys ... yet there are teachers who think they have done a good day's teaching irrespective of what the pupils have learned.

It requires troublesome work to undertake the alteration of old beliefs.

The aim of education is growth: the aim of growth is more growth

No system has ever as yet existed which did not in some form involve the exploitation of some human beings for the advantage of others.

The best preparation for the future is a well-spent today.

Every great advance in science has issued from a new audacity of imagination. What are now working conceptions, employed as a matter of course because they have withstood the tests of experiment and have emerged triumphant, were once speculative hypotheses.

Criticism of the commitment of religion to the supernatural is thus positive in import.