There are two kinds of geniuses: the 'ordinary' and the 'magicians.' an ordinary genius is a fellow whom you and I would be just as good as, if we were only many times better. There is no mystery as to how his mind works. Once we understand what they've done, we feel certain that we, too, could have done it. It is different with the magicians... Feynman is a magician of the highest caliber.

Mark Kac about Richard Feynman, cited in: Scott D. Tremaine (2011) "John norris Bahcall. 1934–2005. A Biographical Memoir"