add Stones _in infinitum,_ the Gravity would increase _in infinitum_
too. And if it were possible, that that Stone should grow still bigger,
till it reach'd to an infinite Extension, the Weight would increase also
in the same proportion; and if on the other side, a Stone should grow to
a certain size, and stop there, the Gravity would also increase to such
a pitch, and no farther. Now it is demonstrated, that all Body must
necessarily be finite; and consequently, that Power which is in Body is
finite too. If therefore we can find any Power, which produces an
Infinite Effect, 'tis plain that it is not in Body. Now we find, that
the Heav'n is mov'd about with a Perpetual Motion, without any
Cessation. Therefore if we affirm the Eternity of the World, it
necessarily follows that the Power which moves it, is not in its own
Body, nor in the other Exterior Body; but proceeds from something
altogether abstracted from Body, and which cannot be describ'd by
Corporeal Adjuncts or Properties. Now he had learn'd from his first
Contemplation of the Sublunary World, that the true Essence of Body
consisted in its _Form,_ which is its Disposition to several sorts of
Motion; but that Part of its Essence which consisted in _Matter_ was
very mean, and scarce possible to be conceiv'd; therefore the Existence
of the whole World consists in its Disposition to be mov'd by this
Mover, who is free from Matter, and the Properties of Body; abstracted
from every thing which we can either perceive by our Senses, or reach by
our Imagination. And since he is the Efficient Cause of the Motions of
the Heavens, in which (notwithstanding their several kinds) there is no
difference, no Confusion, no Cessation; without doubt he has a Power
over it, and a perfect Knowledge of it.

§ 57. Thus his Contemplation this Way, brought him to the same
Conclusion it did the other Way. So that doubting concerning the
Eternity of the World, and its Existence _de novo_, did him no harm at