
Ambrose of Milan
Catena Aurea · Lukasevangelium 3
Now when all the people were baptized, it came to pass, that Jesus also being baptized, and praying, the heaven was opened, And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased.
But the cause of our Lord’s baptism He Himself declares when He says, Thus it becomes us to fulfil all righteousness. But what is righteousness, except that what you would have another do to you, you should first begin yourself, and so by your example encourage others? Let none then avoid the laver of grace, since Christ avoided not the laver of repentance.