Page:The Works of John Locke - 1823 - vol 01.djvu/267

 Ch. 14. by Moses, I can imagine that light existed three days before the sun was, or had any motion, barely by thinking, that the duration of light, before the sun was created, was so long as (if the sun had moved then, as it doth now) would have been equal to three of his diurnal revolutions; so by the same way I can have an idea of the chaos, or angels being created, before there was either light, or any continued motion, a minute, an hour, a day, a year, or one thousand years. For if I can but consider duration equal to one minute, before either the being or motion of any body, I can add one minute more till I come to sixty; and by the same way of adding minutes, hours, or years (i. e. such or such parts of the sun's revolutions, or any other period whereof I have the idea) proceed in infinitum, and suppose a duration exceeding as many such periods as I can reckon, let me add whilst I will: which I think is the notion we have of eternity, of whose infinity we have no other notion than we have of the infinity of number, to which we can add for ever without end.

§ 31. And thus I think it is plain, that from those two fountains of all knowledge before-mentioned, viz. reflection and sensation, we get ideas of duration, and the measures of it.

For, first. By observing what passes in our minds, how our ideas there in train constantly some vanish, and others begin to appear, we come by the idea of succession.

Secondly, By observing a distance in the parts of this succession, we get the idea of duration.

Thirdly, By sensation observing certain appearances, at certain regular and seeming equidistant periods, we get the ideas of certain lengths or measures of duration, as minutes, hours, days, years, &;c.

Fourthly, By being able to repeat those measures of time, or ideas of stated length of duration in our minds, as often as we will, we can come to imagine duration, where nothing does really endure or exist;