“Perhaps genius alone understands genius fully.”
Robert Schumann (1810–1856) German composer, aesthete and influential music critic
Sometimes translated as: Perhaps only genius fully understands genius
Original: Vielleicht versteht nur der Genius den Genius ganz, Robert Schumann, Advice to Young Musicians, translation of Musikalische Haus- und Lebens-Regeln, translated by Henry Hugo Pierson, Leipsic & New York: J. Schuberth & Co., 1860.