Every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving.

Numerous are the academic professors, but rare are wise and noble teachers.

The grand aim of all science is to cover the greatest number of empirical facts by logical deduction from the smallest number of hypotheses or axioms.

The truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.

As a human being, one has been endowed with just enough intelligence to be able to see clearly how utterly inadequate that intelligence is when confronted with what exists.

The greatest activity of which man is capable: Opening up yet another fragment of the frontier of beauty.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.