Genius is its own reward; for the best that one is, one must necessarily be for oneself.... Further, genius consists in the working of the free intellect., and as a consequence the productions of genius serve no useful purpose. The work of genius may be music, philosophy, painting, or poetry; it is nothing for use or profit. To be useless and unprofitable is one of the characteristics of genius; it is their patent of nobility.

The Works of Schopenhauer (ed. 1955)