Plotinus

Thus the One is in truth beyond all statement: any affirmation is of a thing; but ‘all-transcending, resting above even the most august divine Mind’ [Plato Republic] – this is the only true description, since it does not make it a thing among things, nor name it where no name could identify it: we can but try to indicate, in our own way, something concerning it. (Ennead V)