The sex illusion is not a fixed quantity: not what mathematicians call a constant. It varies from zero in my wife's case to madness in that of our stepsister.

When I was young, I observed that nine out of ten things I did were failures. So I did ten times more work.

Only on paper has humanity yet achieved glory, beauty, truth, knowledge, virtue, and abiding love.

The test of good education is seeing how it behaves in a fight.

The natural term of the affection of the human animal for its offspring is six years.

What you are to do without me I cannot imagine.

It's all that the young can do for the old, to shock them and keep them up to date.