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THE

CHAP. XII.

Of the Understanding of Man.

HE understanding of man does so surpass that of brutes, that some are of opinion brutes are mere machines, without any manner of perception at all. But letting this opinion alone, as ill-grounded, we will proceed to the consideration of human understanding, and the distinct operations thereof.

The lowest degree of it consists in perception, which we have before in part taken notice of, in our discourse of the senses. Concerning which it may be convenient farther to observe, that, to conceive a right notion of perception, we must consider the distinct objects of it, which are simple ideas; v. g. such as are those signified by these words, scarlet, blue, sweet, bitter, heat, cold, &c. from the other objects of our senses; to which we may add the internal operations of our minds, as the objects of our own reflection, such as are thinking, wil ling, &c.

Out of these simple ideas are made, by putting them together, several compounded or complex ideas; as those signified by the words pebble, marygold, horse.

The next thing the understanding doth in its progress to knowledge, is to abstract its ideas, by which abstrac tion they are made general.

A general idea is an idea in the mind, considered there as separated from time and place; and so capable to represent any particular being that is conformable to it. Knowledge, which is the highest degree of the speculative faculties, consists in the perception of the truth of affirmative, or negative, propositions.

This perception is either immediate, or mediate. Immediate perception of the agreement, or disagreement, of two ideas, is when, by comparing them together in our minds, we see, or, as it were, behold, their agreement, or disagreement. This therefore is called intuitive knowledge. Thus we see that red is not green; Ff 4

that

that the whole is bigger than a part; and that two and two are equal to four.

The truth of these, and the like propositions, we know by a bare simple intuition of the ideas themselves, without any more ado; and such propositions are called selfevident.

The mediate perception of the agreement, or disa greement, of two ideas, is when, by the intervention of one or more other ideas, their agreement, or disagreement, is shown. This is called demonstration, or rational knowledge. For instance: The inequality of the breadth of two windows, or two rivers, or any two bodies that cannot be put together, may be known by the intervention of the same measure, applied to them both; and so it is in our general ideas, whose agreement or disagreement may be often shown by the intervention of some other ideas, so as to produce demonstrative knowledge; where the ideas in question cannot be brought together, and immediately compared, so as to produce intuitive knowledge.

The understanding doth not know only certain truth; but also judges of probability, which consists in the likely agreement, or disagreement, of ideas.

The assenting to any proposition as probable is called opinion or belief.

We have hitherto considered the great and visible parts of the universe, and those great masses of matter, the stars, planets, and particularly this our earth, together with the inanimate parts, and animate inhabitants of it; it may be now fit to consider what these sensible bodies are made of, and that is of unconceivably small bodies, or atoms, out of whose various combinations bigger moleculæ are made and so, by a greater and greater composition, bigger bodies; and out of these the whole material world is constituted.

By the figure, bulk, texture, and motion, of these small and insensible corpuscles, all the phænomena of bodies may be explained,

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TRANSLATED OUT OF THE FRENCH FROM THE SECOND VOLUME OF THE BIBLIOTHEQUE UNIVERSELLE,

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