Song of Solomon 6:6

He praises these sheep also in the Song of Solomon, speaking of some perfect ones as the teeth of his spouse the holy church.

Separated from the world, to which they were once conformed, they pass over into the members of the church. And rightly therefore are they, through whom such things are done, called teeth like to shorn sheep; for they have laid aside the burdens of earthly cares, and coming up from the bath, from the washing away of the filth of the world by the sacrament of baptism, every one bears twins. For they fulfill the two commandments, of which it is said, "On these two commandments hang all the law and the prophets": 16 loving God with all their heart, and with all their soul and with all their mind, and their neighbor as themselves.

All lambs of twin births, etc. For all the sheep with which the bride's teeth are arranged are multiplied by twin births, because every speech of the elect is fruitful with the twin love, that is, the love by which God and neighbor are loved; every speech talks about the perpetual health of mind and body; every speech is accustomed to fortify its listeners through the arms of justice which must be held both on the right and the left; every speech desires to deal with the promise of life, which is both present and future; nor does anything proceed from the mouth of the righteous that is not advantageous to the fruit of eternal salvation. And fittingly, indeed, the sheep, by which the bride's teeth are bestowed, are said to bear twin offspring, because without doubt through the things we say, we are able to benefit our neighbors and to instruct them in the way of virtue; through those things which we healthily think, we benefit ourselves. We ourselves make a living sacrifice to the internal judge on the altar of the heart, but to our neighbors, for edification, we disclose what we carry within ourselves only through words. Whence someone, pleasing the Creator with such a sacrifice, said, "In me are, God, God, your vows, which I will render in praises to you" (Psalm 53). But if in teeth, as previously mentioned, we understand preachers to be designated, and in hair, listeners, which most aptly corresponds, not only because the former minister speech and nourishment to the body, and the latter provide gentle adornments to the head, as beneficial instruments, but also because the former are placed first in the forefront, like predecessors, and the latter, like successors, cover the back part of the head, it is evident that it is fitting for those who are still unskilled and weaker to listen to and obey the teachings of the elders. But those very teachers, it is fitting not only to fulfill the divine commands but also to increase the flock of the supreme shepherd by preaching.