• It may be seriously questioned whether the philosophies... which isolate mind and set it over against the world did not have their origin in the fact that the reflective or theoretical class of men elaborated a large stock of ideas which social conditions did not allow them to act upon and test. Consequently men were thrown back into their own thoughts as ends in themselves.

    John Dewey (2015). “Democracy and Education: Top American Authors”, p.121, 谷月社