As soon as we abandon our own reason, and are content to rely upon authority, there is no end to our troubles.

In spreading his ideas, Plato was willing to employ emotional appeals, state propaganda, and the use of force.

Boys and girls should be taught respect for each other's liberty... and that jealousy and possessiveness kill love.

Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.

The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.

In spite of Death, the mark and seal of the parental control, Man is yet free, during his brief years, to examine, to criticise, to know, and in imagination to create. To him alone, in the world with which he is acquainted, this freedom belongs; and in this lies his superiority to the resistless forces that control his outward life.

One of the most painful circumstances of recent advances in science is that each one makes us know less than we thought we did