I believe serious progress (in the abolition of war) can be achieved only when men become organized on an international scale and refuse, as a body, to enter military or war service.

It is nothing short of a miracle that modern methods of teaching have not yet entirely strangled that sacred spirit of curiosity and inquiry, for this delicate plant needs freedom no less than stimulation.

Men should continue to fight, but they should fight for things worth while, not for imaginary geographical lines, racial prejudices and private greed draped in the color's of patriotism.

Rejoice with your family in the beautiful land of life.

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

We can't solve today's problems with the mentality that created them.

Nationalism is an infantile disease. It is the measles of mankind.