2. Its idea from reflection on the train of our ideas.
The answer of a great man, to one who asked what time was:
Si non rogas intelligo, (which amounts to this; The more I set myself to think of it, the less I understand it,) might
perhaps persuade one that time, which reveals all other things, is itself not to be discovered. Duration, time, and
eternity, are, not without reason, thought to have something very abstruse in their nature. But however remote
these may seem from our comprehension, yet if we trace them right to their originals, I doubt not but one of those
sources of all our knowledge, viz., sensation and reflection, will be able to furnish us with these ideas, as clear and
distinct as many others which are thought much less obscure; and we shall find that the idea of eternity itself is
derived from the same common original with the rest of our ideas.