Ambrose of Milan — as excerpted in the Catena Aurea on Luke 20:41-44

“They are not blamed here because they acknowledge Him to be David’s Son, for the blind man for so doing was thought worthy to be healed. (Luke 18:42.) And the children saying, Hosanna to the Son of David, (Matt. 21:9.) rendered to God the glory of the highest praise; but they are blamed because they believe Him not to be the Son of God. Hence it is added, And David himself saith in the book of Psalms, The Lord said unto my Lord. (Ps. 110:1.) Both the Father is Lord and the Son is Lord, but there are not two Lords, but one Lord, for the Father is in the Son, and the Son is in the Father. He Himself sits at the right hand of the Father, for He is coequal with the Father, inferior to none; for it follows, Sit thou at my right hand. He is not honoured by sitting at the right hand, nor is He degraded by being sent. Degrees of dignity are not sought for, where is the fulness of divinity.”