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

I have always considered myself as an Agnostic.

Sometimes we stare so long at a door that is closing that we see too late the one that is open.

The most successful men in the end are those whose success is the result of steady accretion. It is the man who carefully advances step by step, with his mind becoming wider and wider - and progressively better able to grasp any theme or situation - persevering in what he knows to be practical, and concentrating his thought upon it, who is bound to succeed in the greatest degree.

The inventor is a man who looks around upon the world and is not contented with things as they are. He wants to improve whatever he sees, he wants to benefit the world; he is haunted by an idea. The spirit of invention possesses him, seeking materialization.

Don't keep forever on the public road, going only where others have gone and following one after the other like a flock of sheep. Leave the beaten track occasionally and dive into the woods.

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