I believe myself that romantic love is the source of the most intense delights that life has to offer. In the relation of a man and woman who love each other with passion and imagination and tenderness, there is something of inestimable value, to be ignorant of which is a great misfortune to any human being.

Every increase in knowledge requires an increase in wisdom

Philosophy, if it cannot answer so many questions as we could wish, has at least the power of asking questions which increase the interest of the world, and show the strangeness and wonder lying just below the surface even in the commonest things of daily life.

The dictum that human nature cannot be changed is one of those tiresome platitudes that conceal from the ignorant the depths of their own ignorance.

Science may set limits to knowledge, but should not set limits to imagination.

Physics, owing to the simplicity of its subject matter, has reached a higher state of development than any other science.

A proverb is one man's wit and all men's wisdom.