Genius is nothing more than common faculties refined to a greater intensity. There are no astonishing ways of doing astonishing things. All astonishing things are done by ordinary materials.
Source: In A New Dictionary of Quotations, by H.L. Mencken, 1942.
-- Benjamin Haydon, (Jan 26 1786-1846), US painter, writer; A painter in the Grand Manner expounded by Reynolds, Haydon was also a popular teacher, writer, and lecturer.