Benedict de Spinoza, THE ETHICS
(Ethica Ordine Geometrico Demonstrata)
Translated by R. H. M. Elwes
PART I: CONCERNING GOD.
I. 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.
II. 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.