5625. It may appear from these things, that all their natural ideas pass away, for these are based upon spaces and times; and, consequently, that material ideas perish, and those which are in their stead relate to the changes and variations of there state. From very many ideas closely observed, it may be evident how it is that natural thought, and especially sensual thought, cannot withdraw from the notion of space and time; and that, if it withdraws, it is scarcely able to think; for the natural cannot think abstractedly from times and spaces.