Plato proves that the first cause of motion must be a living thing:
Life is self motion (this is the definition of life)
What is moving first is not being moved by another (evident from the terms)
What moves first must be alive.
On the basis of this proof, as soon as we conclude that there is one first unmoved mover of the universe, we can straightaway conclude that this unmoved mover is alive, and even that he has the highest life. We know that his mind is all knowing and his will is all loving. The act of no will could be greater than his, just as the act of no mind could be greater than his. It is absolutely impossible to know something more than the Prime Mover knows it, or to love something more than the Prime Mover loves it.