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• To be a Naturalist is better than to be a King.
  • Journal (31 December, 1893)

• The beauty and genius of a work of art may be reconceived, though its first material expression be destroyed; a vanished harmony may yet again inspire the composer; but when the last individual of a race of living beings breathes no more, another heaven and another earth must pass before such a one can be again.
  • The Bird (1906)

• The isness of things is worth studying; but it is their whyness that makes life worth living.
  • On Agression, Konrad Lorenz (1963)