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If Knowledge then is such as we have described it, the Knowledge

produced by demonstrative reasoning must be drawn from premisses

true and first, and incapable of syllogistic proof, and better

known, and prior in order of time, and causes of the conclusion,

for so the principles will be akin to the conclusion

demonstrated.

(Syllogism, of course there may be without such premisses, but it

will not be demonstration because it will not produce knowledge).

True, they must be, because it is impossible to know that which

is not.

First, that is indemonstrable, because, if demonstrable, he

cannot be said to know them who has no demonstration of them for

knowing such things as are demonstrable is the same as having

demonstration of them.