I have remained a simple fellow who asks nothing of the world; only my youth is gone - the enchanting youth that forever walks on air.

A theory is something nobody believes, except the person who made it. An experiment is something everybody believes, except the person who made it.

The world needs heroes and it's better they be harmless men like me than villains like Hitler

The whole of science is nothing more than a refinement of everyday thinking.

What distinguishes the language of science from language as we ordinarily understand the word? ... What science strives for is an utmost acuteness and clarity of concepts as regards their mutual relation and their correspondence to sensory data.

Everyday is an oportunity to make a new happy ending.

There is a driving force more powerful than steam, electricity and nuclear power: the will.