Because we have to use numbers so much we tend to think of every proce — Sui generis

"A common stone meets with more ready patronage than a man of genius. It may be said to have its social home and proper place of refuge in some Society, expressly established for its discovery, polishing, classification, preservation, &c., and all its numerous claims to notice and learned consideration, are admitted instantly; but Genius is "sui generis," and a homeless outcast by general consent, during the full term of its natural life. Driven through the inhospitable desert of mortality, or tossed upon its bleak and stormy seas, the man of genius finds at length a haven in posterity; and there, after due course of precedence has fulfilled its progressive order, his claim also is gradually admitted: the tenacious world being quite sure that he is dead "as any stone."

"According to the extent to which a spirit is sui generis, the limits of what is permitted—that is, beneficial to him—become more and more narrow."

"In the human race, also, the superior specimens, the happy cases of evolution, are the first to perish amid the fluctuations of chances. ... The short duration of beauty, of genius, of the Caesar, is sui generis: such things are not hereditary. The type is inherited, there is nothing extreme or particularly "happy" about a type. ... The higher type is an example of an incomparably greater degree of complexity—a greater sum of co-ordinated elements: but on this account disintegration becomes a thousand times more threatening. "Genius" is the sublimest machine in existence—hence it is the most fragile."