"We call material all that is, all that is produced in the real world, in man as well as outside of man, and we apply the name ideal exlusively to the products of man's cerebral action; but as our brain is a wholly material organization, and as, consequently, all is functions are material (...), it follows that what we call matter or material world (...) does inevitably include the ideal.”
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102 pgs, 24 × 17 cm, Softcover, 2012,