People are not remembered by how few times they fail, but by how often they succeed. Every wrong step is another step forward

I do not believe in the God of the theologians; but that there is a Supreme Intelligence I do not doubt.

I have a peculiar theory about radium, and I believe it is the correct one. I believe that there is some mysterious ray pervading the universe that is fluorescing to it. In other words, that all its energy is not self-constructed but that there is a mysterious something in the atmosphere that scientists have not found that is drawing out those infinitesimal atoms and distributing them forcefully and indestructibly.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

Education isn't play--and it can't be made to look like play. It is hard, hard work. But it can be made interesting work.

When I have fully decided that a result is worth getting I go ahead of it and make trial after trial until it comes.

The doctor of the future will no longer treat the human frame with drugs, but rather will cure and prevent disease with nutrition.