God has strewn our paths with wonders and we certainly should not go through life with our eyes shut

You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them.

Great discoveries and improvements invariably involve the cooperation of many minds.

Man is an animal which, alone among the animals, refuses to be satisfied by the fulfillment of animal desires.

We are all too much inclined, I think, to walk through life with our eyes shut. There are things all round us and right at our very feet that we have never seen, because we have never really looked.

It is the man who carefully advances step by step...who is bound to succeed in the greatest degree.

The nation that secures control of the air will ultimately control the world.