1 What in the holy Gospel is spoken briefly ought not briefly to be expounded, so that what is read may be understood. The words of the Lord are few, but great; to be valued not by number, but by weight: not to be despised because they are few, but to be sought because they are great. You who were present yesterday have heard, as we discoursed according to our ability from that which the Lord said, “You judge after the flesh: I judge not any man. But yet if I judge, my judgment is true; because I am not alone, but I and the Father that sent me.
It is written in your law, that the testimony of two men is true. I am one that bear witness of myself, and the Father that sent me bears witness of me.” Yesterday, as I have said, from these words a discourse was delivered to your ears and to your minds. When the Lord had spoken these words, they who heard, “You judge after the flesh,” manifested the truth of what they had heard. For they answered the Lord, as He spoke of God His Father, and said to Him, “Where is your Father?”
The Father of Christ they understood carnally, because they judged the words of Christ after the flesh. But He who spoke was openly flesh, but secretly the Word: man visible, God hidden. They saw the covering, and despised the wearer: they despised because they knew not; knew not, because they saw not; saw not, because they were blind; they were blind, because they believed not.
Source: Tractates on the Gospel of John (New Advent)