The first requisite for ...

The first requisite for success is to develop the ability to focus and apply your mental and physical energies to the problem at hand - without growing weary. Because such thinking is often difficult, there seems to be no limit to which some people will go to avoid the effort and labor that is associated with it.
The first requisite for success is to develop the ability to focus and apply your mental and physical energies to the problem at hand - without growing weary. Because such thinking is often difficult, there seems to be no limit to which some people will go to avoid the effort and labor that is associated with it.
 Thomas A. Edison

Quotes from the same author

The memory of my mother will always be a blessing to me.
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 Thomas A. Edison
My mother was the making of me.
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 Thomas A. Edison
My mother was the making of me. She was so true and so sure of me, I felt that I had someone to live for - someone I must not disappoint. The memory of my mother will always be a blessing to me.
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 Thomas A. Edison
I am long on ideas, but short on time. I expect to live to be only about a hundred.
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 Thomas A. Edison
There will one day spring from the brain of science a machine or force so fearful in its potentialities, so absolutely terrifying, that even man, the fighter, who will dare torture and death in order to inflict torture and death, will be appalled, and so abandon war forever.
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 Thomas A. Edison