When we speak of God, we do not say all that we might (for that is known to Him only) but only what human nature is able to receive and our weakness can bear. We do not explain what God is but candidly confess that our knowledge of Him is not exact. Where God is concerned, confessing our ignorance is the sign of greatest knowledge.
St. Cyril of Jerusalem, Catechetical Lectures, VI.2
Locus Communis 