3 Seeing then it is no longer the fisherman the son of Zebedee, but He who knows “the deep things of God”, the Holy Spirit I mean, that strikes this lyre, let us hearken accordingly. For he will say nothing to us as a man, but what he says, he will say from the depths of the Spirit, from those secret things which before they came to pass the very Angels knew not; since they too have learned by the voice of John with us, and by us, the things which we know. And this has another Apostle declared, saying, “To the intent that unto the principalities and powers might be known by the Church the manifold wisdom of God.” If then principalities, and powers, and Cherubim, and Seraphim, learned these things by the Church, it is very clear that they were exceedingly earnest in listening to this teaching; and even in this we have been not a little honored, that the Angels learned things which before they knew not with us; I do not at present speak of their learning by us also.
Let us then show much silence and orderly behavior; not today only, nor during the day on which we are hearers, but during all our life, since it is at all times good to hear Him. For if we long to know what is going on in the palace, what, for instance, the king has said, what he has done, what counsel he is taking concerning his subjects, though in truth these things are for the most part nothing to us; much more is it desirable to hear what God has said, especially when all concerns us.
And all this will this man tell us exactly, as being a friend of the King Himself, or rather, as having Him speaking within himself, and from Him hearing all things which He hears from the Father. “I have called you friends,” He says, “for all things that I have heard of My Father, I have made known unto you.”
Source: Homilies on the Gospel of John (New Advent)