d, by what I
have urged.

We have now perceived, that all the explanations commonly
given of nature are mere modes of imagining, and do not indicate
the true nature of anything, but only the constitution of the
imagination; and, although they have names, as though they were
entities, existing externally to the imagination, I call them
entities imaginary rather than real; and, therefore, all
arguments against us drawn from such abstractions are easily
rebutted.

Many argue in this way. If all things follow from a
necessity of the absolutely perfect nature of God, why are there
so many imperfections in nature? such, for instance, as things
corrupt to the point of putridity, loathsome deformity,
confusion, evil, sin, &c. But these reasoners are, as I have
said, easily confuted, for the perfection of things is to be
reckoned only from their own nature and power; things are not
more or less perfect, according as they delight or offend human
senses, or according as they are serviceable or repugnant to
mankind. To those who ask why God did not so create all men,
that they should be governed only by reason, I give no answer but
this: because matter was not lacking to him for the creation of
every degree of perfection from highest to lowest; or, more
strictly, because the laws of his nature are so vast, as to
suffice for the production of everything conceivable by an
infinite intelligence, as I have shown in Prop. xvi.

Such are the misconceptions I have undertaken to note; if
there are any more of the same sort, everyone may easily
dissipate them for himself with the aid of a little reflection.

Part II.

ON THE NATURE AND ORIGIN OF THE MIND

PREFACE

I now pass on to explaining the results, which must
necessarily follow from the essence of God, or of the eternal and
infinite being; not, indeed, all of them (for we proved in Part
i., Prop. xvi., that an infinite number must follow in an
infinite number of ways), but only those which are able to lead
us, as it were by the hand, to the knowledge of the human mind
and its highest blessedness.

DEFINITIONS

DEFINITION I. By body I mean a mode which expresses in a certain
determinate manner the essence of God, in so far as he is
considered as an extended thing. (See Pt. i., Prop. xxv.,
Coroll.)

DEFINITION II. I consider as belonging to the essence of a thing
that, which being given, the thing is necessarily given also,
and, which being removed