Greatness means the construction of an inner world, and the communication of this inner world to the physical world of humanity. The two belong together; neither is thinkable without the other. The strongest feeling and the most vivid imagination are worthless to humanity if they do not manifest themselves; the greatest constructive talent is worthless if it does not serve a creative power that is capable of forming a cosmos.
Einstein, Alfred (1941) Greatness in music. Trans. César Saerchinger. New York: Oxford, p.163. Cited in: Barrett-Ayres, Reginald (1974) Joseph Haydn and the String Quartet. London: Barrie & Jenkins, p. 387.