Thomas alva edison

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van Thomas-alva-edison in de database.
Many of life's failures are people who did not realize how close they were to success when they gave up.
I find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.
The first requisite for success is the ability to apply your physical and mental energies to one problem incessantly without growing weary.
One might think that the money value of an invention constitutes its reward to the man who loves his work. But... I continue to find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.
There is no substitute for hard work.