yet nevertheless we must of necessity confess the more simple and universal things to be True, of which (as of true Colours) these Images of things (whether[6] true or false) which are in our minds are made; such as are the nature of a body in General, and its Extension, also the shape of things extended, with the quantity or bigness of them; their number also, and place wherein they are, the time in which they continue, and the like, and therefore from hence we make no bad conclusion, that Physick, both Natural, and Medicinal, Astronomy, and all other sciences, which depend on the consideration of compound things, are Doubtful. But that Arithmetick, Geometry, and the like (which treat only of the most simple, and General things not regarding whether they really are or not) have in them something certain and undoubted; for whether I sleep or wake, two and three added make five; a square has no more sides than four &c. neither seems it possible what such plain truths can be doubted off.
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