I have heard articulate speech produced by sunlight I have heard a ray of the sun laugh and cough and sing! … I have been able to hear a shadow, and I have even perceived by ear the passage of a cloud across the sun's disk.

Before anything else, preparation is the key to success.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

When one door closes, another one opens.

When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.

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

The great advantage [the telephone] possesses over every other form of electrical apparatus consists in the fact that it requires no skill to operate the instrument.