It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.

Those who condemn the supreme certainty of mathematics feed on confusion, and can never silence the contradictions of the sophistical sciences which lead to eternal quackery.

If numerous species, belonging to the same genera or families, have really started into life all at once, the fact would be fatal to the theory of descent with slow modification through natural selection.

You must put your head into the lion's mouth if the performance is to be a success.

A theory is the more impressive the greater the simplicity of its premises, the more different things it relates, and the more extended its area of applicability.

The only performance that makes it, that makes it all the way is the one that achieves madness.