Round about the accredited and orderly facts of every science there ever floats a sort of dust-cloud of exceptional observations, of occurrences minute and irregular and seldom met with, which it always proves more easy to ignore than to attend to... Anyone will renovate his science who will steadily look after the irregular phenomena, and when science is renewed, its new formulas often have more of the voice of the exceptions in them than of what were supposed to be the rules.

Impulse without reason is enough, and reason without impulse is a poor makeshift.

With mere good intentions hell is proverbially paved.

In the deepest heart of all of us there is a corner in which the ultimate mystery of things works sadly.

We may be in the Universe as dogs and cats are in our libraries, seeing the books and hearing the conversation, but having no inkling of the meaning of it all.

All religions begin with the cry Help.

Act in earnest and you will become earnest in all you do.