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Aristotle, Posterior Analytics A, 71b 18-23

By demonstration I mean a syllogism which produces scientific knowledge, in other words one which enables us to know by the mere fact that we grasp it.
Νοw if knowledge is such as we have assumed, the demonstrative knowledge must proceed from premisses which are true, primary, immediate, better known than, prior to, and causative of the conclusion. Οn these conditions only will the first principles be properly applicable to the fact which is to be proved.

Aristotle, Posterior Analytics, by HUCH TREDENNICK, M.A. Professor of Classics in the University of London,
Harvard University Press

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