The senses
may register and report facts, but they can never arrive at an
understanding of necessary truths; the source of this kind of knowledge
is the rational mind, which has an active disposition to draw out these
infallible laws and eternal truths from its own bosom. The main
tendency of the rational mind is not towards mere phenomena, but their
scientific explanation. It seeks to trace effects, as presented to us
by the senses, back to the causes which produced them; or contemplating
things wholly metaphysical, it seeks to follow out the laws which it
has itself discovered, till they have gone through a thousand probable
contingencies and lost themselves in numberless results. It is on
account of this capacity and tendency of the human mind to look through
fact to law, through individuals to classes, through effects to causes,
through phenomena to general principles, that the late Dr. Burnap was
led to declare, in a very interesting course of lectures which he
delivered before the Lowell Institute a few years since, that he
considered the first characteristic difference between the highest
species of animals and the lowest race of man to be a capacity of
science. But is not the whole edifice of human science built upon the
simple faculty of comparison?
This is the ultimate analysis of all the highest manifestations of the
human mind, whether of judgment, or reason, or intellect, or common
sense, or the power of generalization, or the capacity of science.
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