iii.) nothing which is in itself and is conceived through itself.

But modes (by Def.
v.) can neither be, nor be conceived without substance; wherefore they can only be in the divine nature, and can only through it be conceived.

But substances and modes form the sum total of existence (by Ax.

i.), therefore, without God nothing can be, or be conceived.

Q.E.D.
Note .-- Some assert that God, like a man, consists of body and mind, and is susceptible of passions.