Knowledge keeps no better than fish.

Everything of importance has been said before by somebody who did not discover it.

When you're average, you're just as close to the bottom as you are the top.

It belongs to the self-respect of intellect to pursue every tangle of thought to its final unravelment.

The world is shocked, or amused, by the sight of saintly old people hindering in the name of morality the removal of obvious brutalities from a legal system.

Knowledge is always accompanied with accessories of emotion and purpose.

It is a profoundly erroneous truism, repeated by all copy books and by eminent people when they are making speeches, that we should cultivate the habit of thinking of what we are doing. The precise opposite is the case. Civilization advances by extending the number of important operations which we can perform without thinking about them.