can be sufficient to remove this doubt, unless they presuppose the
existence of God. For, in the first place even the principle which I have
already taken as a rule, viz., that all the things which we clearly and
distinctly conceive are true, is certain only because God is or exists and
because he is a Perfect Being, and because all that we possess is derived
from him: whence it follows that our ideas or notions, which to the extent
of their clearness and distinctness are real, and proceed from God, must
to that extent be true. Accordingly, whereas we not infrequently have ideas
or notions in which some falsity is contained, this can only be the case with
such as are to some extent confused and obscure, and in this proceed from
nothing (participate of negation), that is, exist in us thus confused because
we are not wholly perfect. And it is evident that it is not less repugnant
that falsity or imperfection, in so far as it is imperfection, should proceed
from God, than that truth or perfection should proceed from nothing. But if
we did not know that all which we possess of real and true proceeds from a
Perfect and Infinite Being, however clear and distinct our ideas might be,
we should have no ground on that account for the assurance that they possessed
the perfection of being true.

But after the knowledge of God and of the soul has rendered us certain of
this rule, we can easily understand that the truth of the thoughts we
experience when awake, ought not in the slightest degree to be called in
question on account of the illusions of our dreams. For if it happened
that an individual, even when asleep, had some very distinct idea, as, for
example, if a geometer should discover some new demonstration, the
circumstance of his being asleep would not militate against its truth; and
as for the most ordinary error of our dreams, which consists in their
representing to us various objects in the same way as our external senses,
this is not prejudicial, since it leads us very properly to suspect the
truth of the ideas of sense; for we are not infrequently deceived in the