Nineteen hundred and three will bring great advances in surgery, in the study of bacteria, in the knowledge of the cause and prevention of disease. Medicine is played out. Every new discovery of bacteria shows us all the more convincingly that we have been wrong and that the million tons of stuff we have taken was all useless.

X-rays ... I am afraid of them. I stopped experimenting with them two years ago, when I came near to losing my eyesight and Dally, my assistant practically lost the use of both of his arms.

To me, the idea and expectation that the day is slowly and surely coming when we will be able to honestly say we are our brother's keeper and not his oppressor is very beautiful .

We don't know a millionth of one percent about anything.

The Bible of nature is the best damn Bible in the world. Its laws are perfect and grand, and all the prayers in the world can't change them. There is intelligence and law in this world, and there may be supreme intelligence and law, but so far as the religion of the day is concerned, it is all a damned fake.

My mother was the making of me.

Nature is truly wonderful. Only man is truly foul.