Augustine of Hippo

We are not to administer rebukes until we have removed from our eye the beam of envy or malice or pretense, so that we may have clear vision to cast out the speck from a brother's eye. For we shall then see that speck with the eyes of the dove, the kind of eyes that are commended [as belonging to] the spouse of Christ, the glorious church which God has chosen for himself, the church which has neither spot nor wrinkle, that is, the church which is pure without guile.

Sermon On The Mount 2:19.66 ↗

Ambrose of Milan

But Christ, beholding his church, for whom he himself, as you find in the book of the prophet Zechariah, had put on filthy garments, now clothed in white raiment, seeing, that is, a soul pure and washed in the laver of regeneration, says, "Behold, you are fair, my love, behold you are fair, your eyes are like a dove's," in the likeness of which the Holy Spirit descended from heaven. The eyes are beautiful like those of a dove, because in the likeness of a dove the Holy Spirit descended from heaven.

On the Mysteries 7:37 ↗

Bede

Without that which lies hidden within. Without the invisible reward in the heavens, which in your pilgrimage on earth you are not yet able to see. For this is the greater beauty of glory, which cannot be worthily evaluated at present. And beautifully, where he praises the simplicity of her eyes, that is, the knowledge of what is hidden in her, he also calls her a friend, according to the Lord's words: "I no longer call you servants, because a servant does not know what his master is doing. …

Commentary on the Song of Songs ↗