My scientific work is motivated by an irresistible longing to understand the secrets of nature not by other feelings.

For me the Jewish religion like all other religions is an incarnation of the most childish superstitions.

The ideas that have lighted my way have been kindness, beauty and truth.

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.

All that is valuable in human society depends upon the opportunity for development accorded the individual.

The only justifiable purpose of political institutions is to ensure the unhindered development of the individual.

Personally, I experience the greatest degree of pleasure in having contact with works of art. They furnish me with happy feelings of an intensity that I cannot derive from other sources.