Genius is one percent inspiration, ninety-nine percent perspiration.
If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found the object of his search. … I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety percent of his labor.Nikola Tesla, as quoted in The New York Times (19 October 1931)