Wherever you may find the inventor, you may give him wealth or you may take from him all that he has; and he will go on inventing. He can no more help inventing that he can help thinking or breathing.

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

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

Wherever you may find the inventor, you may give him wealth or you may take from him all that he has; and he will go on inventing. He can no more help inventing that he can help thinking or breathing.

Watson, ... if I can get a mechanism which will make a current of electricity vary in its intensity, as the air varies in density when a sound is passing through it, I can telegraph any sound, even the sound of speech.

The achievement of one goal should be the starting point of another.

The day will come when the man at the telephone will be able to see the distant person to whom he is speaking.