John Chrysostom

(Hom. xv. [xiv.] 2.) He adds, Which is in the bosom of the Father. To dwell in the bosom is much more than simply to see. For he who sees simply, hath not the knowledge thoroughly of that which he sees; but he who dwells in the bosom, knoweth every thing. When you hear then that no one knoweth the Father save the Son, do not by any means suppose that he only knows the Father more than any other, and does not know Him fully. For the Evangelist sets forth His residing in the bosom of the Father on this very account: viz. to shew us the intimate converse of the Only-Begotten, and His coeternity with the Father.