No gun is perfectly true. So the marksman, that he may hit the bull's-eye, points elsewhere.

Evolution pays and that is why there is evolution

Some young folks have wind-fall minds, prematurely detached from the tree of knowledge for a life-long sourness and pettiness.

When we try to imagine a chaos we fail. ... In its very fiber the mind is an order and refuses to build a chaos.

Boundaries which mark off one field of science from another are purely artificial, are set up only for temporary convenience. Let chemists and physicists dig deep enough, and they reach common ground.

When a learner, in the fullness of his powers, comes to great truths unstaled by premature familiarity, he rejoices in the lateness of his lessons.

Is any knowledge worthless? Try to think of an example.