It is a very grave mistake to think that the enjoyment of seeing and searching can be promoted by means of coercion and a sense of duty.

Humankind's desire for peace can be realized only by the creation of a world government.

The true measure of a man is the degree to which he has managed to subjugate his ego.

I am not more gifted than anybody else. I am just more curious than the average person and I will not give up a problem until I have found the proper solution.

What is essential in the life of a man of my kind is what he thinks and how he thinks, and not what he does or suffers.

What good is a reputation not put to good use.

The goal of pacifism is possible only though a supranational organization. To stand unconditionally for this cause is the criterion of true pacifism.