I am both pleased but astonished by the fact that mankind has not yet begun to use all the means and devices that are available for destruction. I hope that such weapons are never manufactured in quantity.

Be courageous! Have faith! Go forward.

Whatever the mind of man creates, should be controlled by man's character.

I have friends in overalls whose friendship I would not swap for the favor of the kings of the world.

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

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.

This problem, once solved, will be simple.