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Christian August Crusius


Christian August Crusius (10 January 1715, Leuna – 18 October 1775, Leipzig) was a German philosopher and Protestant theologian.

Crusius was born at Leuna in the Electorate of Saxony. He was educated at the University of Leipzig, and became professor of theology there in 1750, and principal in 1773.

Crusius first came to notice as an opponent of the philosophy of Gottfried Leibniz and Christian Wolff from the standpoint of religious orthodoxy. He attacked it mainly on the grounds of the moral evils that must flow from any system of determinism, and attempted to vindicate the freedom of the will. The most important works of this period of his life are Anweisung, vernünftig zu leben [Guide to Rational Living] (1744), Entwurf der nothwendigen Vernunftwahrheiten wiefern sie den zufälligen entgegengesetzt werden [Outline of the Necessary Truths of Reason, in so far as they are Opposed to Contingent Truths] (1745), Weg zur Gewissheit und Zuverlässigkeit der menschlichen Erkenntniss [Path to Certainty and Reliability in Human Knowledge] (1747), and Anleitung, über natürliche Begebenheiten ordentlich und vorsichtig nachzudenken [Instruction on How to Reflect Correctly and Cautiously on Natural Events] (1749). Crusius' philosophical books had a great but short-lived popularity. His criticism of Wolff influenced Immanuel Kant at the time when his system was forming; and his ethical, as well as epistemological, doctrines are cited in his habilitation thesis and the Critique of Practical Reason. Kant "was deeply influenced by Crusius" and owned Anweisung, Entwurf, and Anleitung.

Crusius's later life was devoted to theology. He led the party in the university which became known as the "Crusianer" as opposed to the "Ernestianer," the followers of JA Ernesti. The two professors adopted opposite methods of exegesis. Ernesti wished to subject the Scripture in the same way as other ancient books; Crusius held firmly to orthodox ecclesiastical tradition.


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