What we cannot think we cannot think, therefore we also cannot say what we cannot think.

I don't like the spirit of socialism - I think freedom is the basis of everything.

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

The fact that all Mathematics is Symbolic Logic is one of the greatest discoveries of our age; and when this fact has been established, the remainder of the principles of mathematics consists of the analysis of Symbolic Logic itself.

Aristotle maintained that women have fewer teeth than men; although he was twice married, it never occurred to him to verify this statement by examining his wives' mouths.

Africans had to be taught that nudity is wicked; this was done very cheaply by missionaries.

In emancipation from the fears that beset the slave of circumstance he will experience a profound joy, and through all the vicissitudes of his outward life he will remain in the depths of his being a happy man.