It is pleasant and good for brothers to dwell in unity. The prophet suggested a comparison for this good and pleasant activity when he said: It is like the ointment on the head which ran down over the beard of Aaron, down upon the collar of his garment. Aaron’s oil was made of the perfumes used to anoint a priest. It was God’s decision that his priest should have his consecration first, and that our Lord should be so anointed, but not visibly, by those who are joined with him. Aaron’s anointing did not belong to this world; it was not done with the horn used for kings, but with the oil of gladness. So afterward Aaron was called the anointed one as the Law prescribed. When this oil is poured out upon men of unclean heart, it snuffs out their lives, but when it is received as an anointing of love, it exudes the sweet odor of harmony with God. As Paul says, we are the goodly fragrance of Christ. So just as it was pleasing to God when Aaron was anointed priest with this oil, so it is good and pleasant for brothers to dwell in unity.