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.

What holds for adults holds even more for children, sensitive and conscious of differences. I certainly hope that the Board of Education will think very, very seriously before it introduces this division and antagonism in our public schools.

Continuity of life means continual readaptation of the environment to the needs of living organisms.

Inference is always an invasion of the unknown, a leap from the known.

Since there is no single set of abilities running throughout human nature, there is no single curriculum which all should undergo. Rather, the schools should teach everything that anyone is interested in learning.

All education which develops power to share effectively in social life is moral.

The path of least resistance and least trouble is a mental rut already made. It requires troublesome work to undertake the alternation of old beliefs. Self-conceit often regards it as a sign of weakness to admit that a belief to which we have once committed ourselves is wrong. We get so identified with an idea that it is literally a pet notion and we rise to its defense and stop our eyes and ears to anything different.