I want you to think of your ...

I want you to think of your life as an hourglass. You know there are thousands of grains of sand in the top of the hourglass; and they all pass slowly and evenly through the narrow neck in the middle. Nothing you or I could do would make more than one grain of sand pass through this narrow neck without impairing the hourglass. You and I and everyone else are like this hourglass.
I want you to think of your life as an hourglass. You know there are thousands of grains of sand in the top of the hourglass; and they all pass slowly and evenly through the narrow neck in the middle. Nothing you or I could do would make more than one grain of sand pass through this narrow neck without impairing the hourglass. You and I and everyone else are like this hourglass.
 Dale Carnegie

Quotes from the same author

Do you know the most important trait a man can have? It is not executive ability; it is not a great mentality; it is not kindliness, nor courage, nor a sense of humor, though each of these is of tremendous importance. In my opinion, it is the ability to make friends, which, boiled down, means the ability to see the best in man.
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 Dale Carnegie
Happiness doesn't depend on any external conditions, it is governed by our mental attitude.
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 Dale Carnegie
Success is getting what you want. Happiness is wanting what you get.
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 Dale Carnegie
Most of the important things in the world have been accomplished by people who have kept on trying when there seemed to be no hope at all.
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 Dale Carnegie
When fate hands us a lemon, let's try to make lemonade.
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 Dale Carnegie