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

Insight, untested and unsupported, is an uncertain guarantee of the truth.

The wise man thinks about his troubles only when there is some purpose in doing so; at other times he thinks about other things, or, if it is night, about nothing at all.

The reason is, and by rights ought to be, slave to the emotions.

Dogmatism is the greatest of mental obstacles to human happiness.

Nine-tenths of the activities of a modern Government are harmful; therefore the worse they are performed, the better.

I am compelled to fear that science will be used to promote the power of dominant groups rather than to make men happy.