The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice.

Hitler is an outcome of Rousseau.

Almost everything that distinguishes the modern world from earlier centuries is attributable to science, which achieved its most spectacular triumphs in the seventeenth century.

The happiness that is genuinely satisfying is accompanied by the fullest exercise of our faculties and the fullest realization of the world in which we live.

This has been my life. I have found it worth living, and would gladly live it again if the second chance were offered me.

Every great idea starts out as a blasphemy.

Every increase in knowledge requires an increase in wisdom