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.

Grand telegraphic discovery today … Transmitted vocal sounds for the first time ... With some further modification I hope we may be enabled to distinguish … the “timbre” of the sound. Should this be so, conversation viva voce by telegraph will be a fait accompli.

Great discoveries and improvements invariably involve the cooperation of many minds. I may be given credit for having blazed the trail, but when I look at the subsequent developments I feel the credit is due to others rather than to myself.

The most successful men in the end are those whose success is the result of steady accretion.

Don't keep forever on the public road, going only where others have gone. Leave the beaten track occasionally and dive into the woods. You will be certain to find something you have never seen before. Of course it will be a little thing, but do not ignore it. One discovery will lead to another, and before you know it, you will have something worth thinking about to occupy your mind, and really big discoveries are the result of thought.

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

One day every major city in America will have a telephone.