Relations all terminate in simple Ideas.
Thirdly, Though there be a great number of considerations wherein things may be compared one with another, and so a multitude of relations, yet they all terminate in, and are concerned about those simple ideas, either of sensation or reflection, which I think to be the whole materials of all our knowledge.

To clear this, I shall show it in the most considerable relations that we have any notion of; and in some that seem to be the most remote from sense or reflection: which yet will appear to have their ideas from thence, and leave it past doubt that the notions we have of them are but certain simple ideas, and so originally derived from sense or reflection.
10.

Terms leading the Mind beyond the Subject denominated, are relative.
Fourthly, That relation being the considering of one thing with another which is extrinsical to it, it is evident that all words that necessarily lead the mind to any other ideas than are supposed really to exist in that thing to which the words are applied are relative words: v.g.a MAN, BLACK, MERRY, THOUGHTFUL, THIRSTY, ANGRY, EXTENDED; these and the like are all absolute, because they neither signify nor intimate anything but what does or is supposed really to exist in the man thus denominated; but FATHER, BROTHER, KING, HUSBAND, BLACKER, MERRIER, &c., are words which, together with the thing they denominate, imply also something else separate and exterior to the existence of that thing.
11.

All relatives made up of simple ideas.
Having laid down these premises concerning relation in general, I shall now proceed to show, in some instances, how all the ideas we have of relation are made up, as the others are, only of simple ideas; and that they all, how refined or remote from sense soever they seem, terminate at last in simple ideas.

I shall begin with the most comprehensive relation, wherein all things that do, or can exist, are concerned, and that is the relation of CAUSE and EFFECT: the idea whereof, how derived from the two fountains of all our knowledge, sensation and reflection, I shall in the next place consider..