Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.

The instinctive need to be the member of a closely knit group fighting for common ideals may grow so strong that it becomes inessential what these ideals are.

The human soul is very much older than the human mind.

The bond with a dog is as lasting as the ties of this earth can ever be.

More than any other product of human scientific culture scientific knowledge is the collective property of all mankind.

I believe that present day civilized man suffers from insufficient discharge of his aggressive drive

Barking dogs may occasionally bite, but laughing men hardly ever shoot!