56 The Caufes and Danger of Self-Deceit. SERM. the fun) fo, there is an interior eye of the mind, III. of equal importance and ufefulnefs to the di- jreEtion of our higheft capacity, and to the chief ends of our being, which is the fenfe of good and evil, both natural and moral ; or, the judgment of the foul concerning their difference, and the methods of purfuing the one, and avoiding the other. This Taft is the fubjedt of our Saviour's inftru &ion in the text, under the allufion of the Tingle and the evil eye; in confequence of which as thefe are in fad the different conditions of men, they are either wifely and juftly guided to the true per- feétion and happinefs of their nature, or in a Rate of ignorance, fatal mifcondué , and mi- fery. There are certain conditions neceffary that the natural organ of fight may properly do its office . It muft be duely framed, and its parts regularly difpos'd, as generally it is; for nature feldom errs in her produâions; and it muft be free from a mixture of corrupt humours with which the eye more frequently happens to be vitiated, and which, experi et4ce teaches us, has unhappy effefts upon the fight ; for in that café the objeét appears dôuble or inverted, or is dimly and confufedly perceived, fo as not to afford a juft diredtion to the affections or attive .powers which in their
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