Irenaeus of Lyons, Against Heresies 4.20
Knowing God by measuring His magnitude is impossible, for no one can measure the Father. But His love leads us to God through His Word, and as we obey Him we always learn how great God truly is. He Himself establishes, chooses, and adorns all things through Himself—He who relates to us—and so we, together with everything He contains, have been made.
Latin
Icrrur secundum magnitudinem non est cognoscere Deum ; impossibile est enim mensurari Patrem ; secundum autem dilectionem ejus, hee est enim que nos per Verbum ejus perducit ad Deum, obedientes ei semper discimus quoniam est tantus Deus, et ipse est qui per semetipsum constituit, et elegit, et adornavit, qui est secundum nos. Et nos igitur cum his que continentur ab eo, factisumus.