Sexual intercourse is a slight attack of apoplexy.

Beautiful objects are wrought by study through effort, but ugly things are reaped automatically without toil.

I am the most travelled of all my contemporaries; I have extended my field of enquiry wider than anybody else, I have seen more countries and climes, and have heard more speeches of learned men. No one has surpassed me in the composition of lines, according to demonstration, not even the Egyptian knotters of ropes, or geometers.

The person who can laugh with life has developed deep roots with confidence and faith-faith in oneself, in people and in the world, as contrasted to negative ideas with distrust and discouragement.

Everything existing in the universe is the fruit of chance and necessity.

Poverty in a democracy is as much to be preferred to what is called prosperity under despots, as freedom is to slavery.

The wise man belongs to all countries, for the home of a great soul is the whole world.