Enthusiasm is the dynamics of ...

Enthusiasm is the dynamics of your personality. Without it, whatever abilities you may possess lie dormant; and it is safe to say that nearly every man has more latent power than he ever learns to use. You may have knowledge, sound judgment, good reasoning faculties; but no one-not even yourself-will know it until you discover how to put your heart into thought and action.
Enthusiasm is the dynamics of your personality. Without it, whatever abilities you may possess lie dormant; and it is safe to say that nearly every man has more latent power than he ever learns to use. You may have knowledge, sound judgment, good reasoning faculties; but no one-not even yourself-will know it until you discover how to put your heart into thought and action.
 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