existence. Wherefore God's existence and God's essence are one
and the same. Q.E.D.
Coroll. I.-Hence it follows that God's existence, like his
essence, is an eternal truth.
Coroll. II-Secondly, it follows that God, and all the
attributes of God, are unchangeable. For if they could be
changed in respect to existence, they must also be able to be
changed in respect to essence-that is, obviously, be changed from
true to false, which is absurd.

PROP. XXI. All things which follow from the absolute nature of
any attribute of God must always exist and be infinite, or, in
other words, are eternal and infinite through the said attribute.
Proof.-Conceive, if it be possible (supposing the proposition
to be denied), that something in some attribute of God can follow
from the absolute nature of the said attribute, and that at the
same time it is finite, and has a conditioned existence or
duration ; for instance, the idea of God expressed in the
attribute thought. Now thought, in so far as it is supposed to
be an attribute of God, is necessarily (by Prop. xi.) in its
nature infinite. But, in so far as it possesses the idea of God,
it is supposed finite. It cannot, however, be conceived as
finite, unless it be limited by thought (by Def. ii.) ; but it is
not limited by thought itself, in so far as it has constituted
the idea of God (for so far it is supposed to be finite) ;
therefore, it is limited by thought, in so far as it has not
constituted the idea of God, which nevertheless (by Prop. xi.)
must necessarily exist.
We have now granted, therefore, thought not constituting the
idea of God, and, accordingly, the idea of God does not naturally