The love of beauty in its multiple forms is the noblest gift of the human cerebrum.

Man cannot remake himself without suffering, for he is both the marble and the sculptor

Hard conditions of life are indispensable to bringing out the best in human personality.

Those who desire to rise as high as our human condition allows, must renounce intellectual pride, the omnipotence of clear thinking, belief in the absolute power of logic.

Perhaps I will stay in Chicago and operate on human beings instead of on dogs. From a business standpoint, it would be excellent. But, as I hate medical practice, I would like better to make little money in doing scientific work than a great deal in doing surgical operations.

The quality of life is more important than life itself.