II. The simplicity and absolute oneness of a living agent cannot, from the nature of the thing, be properly proved by experimental observations. But as these _fall in_ with the supposition of its unity, so they plainly lead us to _conclude_ certainly, that our gross organized bodies, with which we perceive objects of sense, and with which we act, are no part of ourselves; and therefore show us, that we have no reason to believe their destruction to be ours: even without determining whether our living substance be material or immaterial. For we see by experience, that men may lose their limbs, their organs of sense, and even the greatest part of these bodies, and yet remain the same living agents. Persons can trace up the existence of themselves to a time, when the bulk of their bodies was extremely small, in comparison of what it is in mature age: and we cannot but think, that they might _then_ have lost a considerable part of that small body, and yet have remained the same living agents; as they may now lose great part of their present body, and remain so. And it is certain, that the bodies of all animals are in a constant flux;[33] from that never-ceasing attrition, which there is in every part of them. Now, things of this kind unavoidably teach us to distinguish, between these living agents ourselves, and large quantities of matter, in which we are very nearly interested; since these may be alienated, and actually are in a daily course of succession, and changing their owners; whilst we are assured, that each living agent remains one and the same permanent being.[34] And this general observation leads us on to the following ones. _First_, That we have no way of determining by experience, what is the certain bulk of the living being each man calls himself: and yet, till it be determined that it is larger in bulk than the solid elementary particles of matter, which there is no ground to think any natural power can dissolve, there is no sort of reason to think death to be the dissolution of it, of the living being, even though it should not be absolutely indiscerptible.