PART I: CONCERNING GOD.

DEFINITIONS

By that which is 'self-caused' I mean that of which the essence

involves existence, or that of which the nature is only conceivable as existent.
A thing is called 'finite after its kind' when it can be limited by

another thing of the same nature; for instance, a body is called finite because we always conceive another greater body. So, also, a thought is limited by another thought, but a body is not limited by thought, nor a thought by body.
By 'substance' I mean that which is in itself, and is conceived

through itself: in other words, that of which a conception can be formed independently of any other conception.
By 'attribute' I mean that which the intellect perceives as

constituting the essence of substance.
By 'mode' I mean the modifications ("affectiones") of substance, or

that which exists in, and is conceived through, something other than itself.
By 'God' I mean a being absolutely infinite--that is, a substance

consisting in infinite attributes, of which each expresses eternal and infinite essentiality.

>>>>>Explanation--I say absolutely infinite, not infinite after its kind: for, of a thing infinite only after its kind, infinite attributes may be denied; but that which is absolutely infinite, contains in its essence whatever expresses reality, and involves no negation.

That thing is called 'free,' which exists solely by the necessity of

its own nature, and of which the action is determined by itself alone. On the other hand, that thing is necessary, or rather constrained, which is determined by something external to itself to a fixed and definite method of existence or action.
By 'eternity' I mean existence itself, in so far as it is conceived

necessarily to follow solely from the definition of that which is eternal.

>>>>>Explanation--Existence of this kind is conceived as an eternal truth, like the essence of a thing and, therefore, cannot be explained by means of continuance or time, though continuance may be conceived without a beginning or end.

AXIOMS. I. Everything which exists, exists either in itself or in something else.

That which cannot be conceived through anything else must be

conceived through itself.
From a given definite cause an effect necessarily follows; and, on

the other hand, if no definite cause be granted, it is impossible that an effect can follow.
The knowledge of an effect depends on and involves the knowledge of

a cause.
Things which have nothing in common cannot be understood, the one by

means of the other; the conception of one does not involve the conception of the other.
A true idea must correspond with its ideate or object.
If a thing can be conceived as non-existing, its essence does not

involve existence.