Quotation by Baruch Spinoza

He, who has a true idea, simultaneously knows that he has a true idea, and cannot doubt of the truth of the thing perceived.
Baruch (Benedict) Spinoza (1623–1677), Dutch pantheistic philosopher. Ethics, bk. II, prop. Xliii, On the Improvement of the Understanding, the Ethics, and Correspondence, p. 114, trans. by R.H.M. Elwes, Dover, New York (1955).

Spinoza's Ethics was one of the most revolutionary texts of modern philosophy.
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