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.

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

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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.

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You cannot force ideas. Successful ideas are the result of slow growth. Ideas do not reach perfection in a day, no matter how much study is put upon them.

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

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

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When one door closes, another one opens.

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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.

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Observe, Remember, Compare.

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

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