“I never did anything worth doing by accident, nor did any of my inventions come by accident”
More from Thomas Edison
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“The three great essentials to achieve anything worthwhile are: Hard work, Stick-to-itiveness, and Common sense.”
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“Just because something doesn't do what you planned it to do doesn't mean it's useless.”
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“Hell, there are no rules here-- we're trying to accomplish something.”
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“We don't know a millionth of one percent about anything.”
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“If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.”