For the being of God; we are so far from a knowledge of it, so as to be able to instruct one another therein by words and expressions of it, as that to frame any conceptions in our mind, with such species and impressions of things as we receive the knowledge of all other things by, is to make an idol to ourselves, and so to worship a god of our own making, and not the God that made us. We may as well and as lawfully hew him out of wood or stone as form him a being in our minds, suited to our apprehensions. The utmost of the best of our thoughts of the being of God is, that we can have no thoughts of it. Our knowledge of a being is but low when it mounts no higher but only to know that we know it not.
– John Owen –
from The Mortification of Sin in Believers, volume 6 of Works, page 66