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What Knowledge is, is plain from the following of considerations,

if one is to speak accurately, instead of being led away by

resemblances. For we all conceive that what we strictly speaking

know, cannot be otherwise than it is, because as to those things

which can be otherwise than they are, we are uncertain whether

they are or are not, the moment they cease to be within the

sphere of our actual observation.

So then, whatever comes within the range of Knowledge is by

necessity, and therefore eternal, (because all things are so

which exist necessarily,) and all eternal things are without

beginning, and indestructible.