T 3.2.3.7

There remains nothing, but to determine exactly, what is meant by possession; and this is not so easy as may at first sight be imagin'd. We are said to be in possession of any thing, not only when we immediately touch it, but also when we are so situated with respect to it, as to have it in our power to use it; and may move, alter, or destroy it, according to our present pleasure or advantage. This relation, then, is a species of cause and effect; and as property is nothing but a stable possession, deriv'd from the rules of justice, or the conventions of men, 'tis to be consider'd as the same species of relation. But here we may observe, that as the power of using any object becomes more or less certain, according as the interruptions we may meet with are more or less probable; and as this probability may increase by insensible degrees; 'tis in many cases impossible to determine when possession begins or ends; nor is there any certain standard, by which we can decide such controversies. A wild boar, that falls into our snares, is deem'd to be in our possession, if it be impossible for him to escape. But what do we mean by impossible? How do we separate this impossibility from an improbability? And how distinguish that exactly from a probability? Mark the precise limits of the one and the other, and shew the standard, by which we may decide all disputes that may arise, and, as we find by experience, frequently do arise upon this subject[73].