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Aristotle. Daniel C. Stevenson, ур. „De Animus (On the Soul) Book 1 Part 2 (B4 verso)”. The Internet Classics Archive. Превод: J.A. Smith. Архивирано из оригинала 26. 02. 2017. г. Приступљено 5. 2. 2017. „Thales, too, to judge from what is recorded about him, seems to have held soul to be a motive force, since he said that the magnet has a soul in it because it moves the iron.”
