Everything is vague to a degree you do not realize till you have tried to make it precise.

A life without adventure is likely to be unsatisfying, but a life in which adventure is allowed to take whatever form it will is sure to be short.

To acquire immunity to eloquence is of the utmost importance to the citizens of a democracy.

The greatest challenge to any thinker is stating the problem in a way that will allow a solution.

Who ever heard a theologian preface his creed, or a politician conclude his speech with an estimate of the probable error of his opinion?

If an opinion contrary to your own makes you angry, that is a sign that you are subsciously aware of having no good reason for thinking as you do. [...] The most savage controversies are those about matters as to which there is no good evidence either way. Persecution is used in theology, not in arithmetic, because in arithmetic there is knowledge, but in theology there is only opinion. So whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants.

The road to happiness and prosperity lies in an organized diminution of work.