Often referred to as the Proteus among philosophers, Schelling was noted for his ever-changing alertness and brightness of mind and expression. Goethe had a very high regard for him, and spoke of him as "the most congenial philosopher I know." Schelling had a profound influence among the thinkers of his time, including philosophers of France and England. His last years were dedicated to what he termed "positive philosophy," radically different from the philosophy of identity, the transcendental idealism, and the pantheistic tendencies of his earlier time. Rudolf Steiner made extensive reference to Schelling in his writings and lectures, on various occasions praising that philosopher's "important inspirations and suggestions for what must afterwards be said by Anthroposophy, directly out of spiritual vision, on many points of Christianity." Steiner further spoke of Schelling, who really always made a significant impression whenever he appeared in public, the short, thick-set man, with the extremely impressive head, and eyes which even in extreme old age were sparkling with fire, for from his eyes there spoke the fire of Truth, the fire of Knowledge." (From a lecture given at Dornach, Switzerland, Sept. 16, 1924) Perhaps Steiner's greatest study of Schelling is to be found in his Die Ratsel der Philosophie, The Riddles of Philosophy, Vol. I, Ch. 7.