>>>>>Proof--If it could be divided, the parts into which it was
divided would either retain the nature of absolutely infinite
substance, or they would not. If the former, we should have
several substances of the same nature, which (by Prop. v.) is
absurd. If the latter, then (by Prop. vii.) substance
absolutely infinite could cease to exist, which (by Prop. xi.) is
also absurd.
<<<<<Corollary--It follows that no substance, and consequently no
extended substance, in so far as it is substance, is divisible.
*****Note--The indivisibility of substance may be more easily
understood as follows. The nature of substance can only be
conceived as infinite, and by a part of substance, nothing else
can be understood than finite substance, which (by Prop. viii.)
involves a manifest contradiction.