The Republic by Plato Part 2 Page 77

that God is not the author of all things, but of good only.

That will do, he said.

And what do you think of a second principle? Shall I ask you whether God is a magician, and of a nature to appear insidiously now in one shape, and now in another — sometimes himself changing and passing into many forms, sometimes deceiving us with the semblance of such transformations; or is he one and the same immutably fixed in his own proper image?

I cannot answer you, he said, without more thought.

Well, I said; but if we suppose a change in anything, that change must be effected either by the thing itself, or by some other thing?

Most certainly.