Alexander Graham Bell

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.

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

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

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.

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

Before anything else, preparation is the key to success.

The only difference between success and failure is the ability to take action.

What this power is I cannot say; all I know is that it exists and it becomes available only when a man is in that state of mind in which he knows exactly what he wants and is fully determined not to quit until he finds it.

The telephone will be a great success in America, but it will be a failure in England.

I have always been a man of science, and I have always been a man of invention.

The day will come when the man in the street will be able to talk to his friends across the ocean.

The telephone is an instrument of the devil.

I have never been able to do anything that I have not been interested in.

The inventor is a man who looks at the world and is not contented with things as they are. He wants to improve them, he wants to change them, he wants to make them better.

The greatest invention of all time is the human mind.

The telephone is not a toy, it is a serious instrument for serious business.

I have learned that the most important thing in life is to be happy.

The telephone will be a great boon to mankind.

The telephone is a wonderful instrument, but it is not perfect.