Twenty men may be said to exist; but it is only because one, two, three, four, &c.

are existent, and if you deny the existence of the latter, that of the former falls of course.

It is therefore utterly absurd to suppose any number to exist, and yet deny the existence of unites; and as extension is always a number, according to the common sentiment of metaphysicians, and never resolves itself into any unite or indivisible quantity, it follows, that extension can never at all exist.
It is in vain to reply, that any determinate quantity of extension is an unite; but such-a-one as admits of an infinite number of fractions, and is inexhaustible in its sub-divisions.

For by the same rule these twenty men may be considered as a unit.

The whole globe of the earth, nay the whole universe, may be considered as a unit.