All human activity is prompted by desire.

In a logically perfect language, there will be one word and no more for every simple object, and everything that is not simple will be expressed by a combination of words, by a combination derived, of course, from the words for the simple things that enter in, one word for each simple component.

Science tells us what we can know, but what we can know is little, and if we forget how much we cannot know we become insensitive to many things of great importance.

To be happy in this world, especially when youth is past, it is necessary to feel oneself not merely an isolated individual whose day will soon be over, but part of the stream of life flowing on from the first germ to the remote and unknown future.

This illustrates an important truth, namely, that the worse your logic, the more interesting the consequences to which it gives rise.

Dora and I are now married, but just as happy as we were before.

A man is rational in proportion as his intelligence informs and controls his desires.