Pseudo-Chrysostom
Catena Aurea · Matthäusevangelium 3
Then went out to him Jerusalem, and all Judæa, and all the region round about Jordan, And were baptized of him in Jordan, confessing their sins.
Compared with the holiness of John, who is there that can think himself righteous? As a white garment if placed near snow would seem foul by the contrast; so compared with John every man would seem impure; therefore they confessed their sins. Confession of sin is the testimony of a conscience fearing God. And perfect fear takes away all shame. But there is seen the shame of confession where there is no fear of the judgment to come. But as shame itself is a heavy punishment, God therefore bids us confess our sins that we may suffer this shame as punishment; for that itself is a part of the judgment.