Perhaps it is a matter of sustained power of concentration. Perhaps the genius has this ability to maintain steady and unbroken concentration upon the part played without a break so that thoughts of self-consciousness or of what the audience is thinking do not have the power to enter in. Therefore, the artist who has successfully mastered the art of meditation should be able to transfer the qualities so developed to the work of creation or of composition in his art and thus attain a state of genius. For to sit without moving, intensely concentrated, held completely by the object of concentration, is one way of providing part of the necessary conditions for artistic creativity.
-- Notebooks Category 14: The Arts in Culture > Chapter 2: Creativity, Genius > # 51