Demonstration of essential realities is the only argument found faultless by khajeh Tusi to prove immaterial intellect. This demonstration has been
approved by most of the following thinkers.
Demonstration of the eternal realities, presented by Leibniz to prove the
existence of God, is essentially similiar to the demonstration of khajeh.
The philosophical center of Shiraz has presented a logical paradox known
as misleading paradox (Jazr-e-.Asamm) against the demonstration of essential
realities. Khajeh Tusi ignoring the relation of misleading paradox with his own demonstration proving immaterial intellect, in his critique on one of
Abhari's logical works, has suggested a solution to this paradox. The present artical deals with this solution from a historical comparative point of view.
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