The first essential character [of civilization], I should say, is forethought. This, indeed, is what mainly distinguishes men from brutes and adults from children.

Orthodoxy is the grave of intelligence, no matter what orthodoxy it may be.

Neither acquiescence in skepticism nor acquiescence in dogma is what education should produce.

None but a coward dares to boast that he has never known fear.

Teachers are more than any other group the guardians of civilization.

Indignation is a submission of our thoughts, but not of our desires.

Life and hope for the world are to be found only in the deeds of love.