Book XI.
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A kind of image of the Trinity is
pointed out, even in the outer man; first of all, in those things
which are perceived from without, viz. in the bodily object that is
seen, and in the form that is impressed by it upon the sight of the
seer, and in the purpose of the will that combines the two;
although these three are neither mutually equal, nor of one
substance. Next, a kind of trinity, in three somewhats of one
substance, is observed to exist in the mind itself, as it were
introduced there from those things that are perceived from without;
viz. the image of the bodily object which is in the memory, and the
impression formed therefrom when the mind’s eye of the thinker is
turned to it, and the purpose of the will combining both. And this
latter trinity is also said to pertain to the outer man, in that it
is introduced into the mind from bodily objects, which are
perceived from without.