Much of the most important evils that mankind have to consider are those which they inflict upon each other through stupidity or malevolence or both.

Man is the product of causes which had no prevision of the end they were achieving; his origin, his growth, his hopes and fears, his loves and beliefs, are but the outcome of accidental collocations of atoms; no fire, no heroism, no intensity of though and feeling, can preserve an individual life beyond the grave.

The average man's opinions are much less foolish than they would be if he thought for himself.

Orthodoxy is the death of intelligence.

The theoretical understanding of the world, which is the aim of philosophy, is not a matter of great practical importance to animals, or to savages, or even to most civilised men.

Awareness of universals is called conceiving, and a universal of which we are aware is called a concept.

Organic life, we are told, has developed gradually from the protozoon to the philosopher, and this development, we are assured, is indubitably an advance. Unfortunately it is the philosopher, not the protozoon, who gives us this assurance.