“We can also learn from other sources how awesome was the dignity of the priesthood. Indeed, there was a day when some wicked and evil men revolted against Aaron, quarreled with him over his position in the community and tried to drive him from his leadership. Moses, the mildest of men, wanted to persuade them by the facts themselves that he had not brought Aaron to the leadership because he was a brother, relative or member of his family but that it was in obedience to God's decree that he had entrusted the priesthood to him. So he ordered each tribe to bring a staff, and Aaron was instructed to do the same.When each tribe had brought a staff, Moses took all of them and put them inside the meeting tent. Once he had put them there, he gave orders that they await the decision of God which would come to them through those staves. Then all the other staves kept their same appearance, but a single one—Aaron's—blossomed and put forth leaves and fruit. So the Lord of nature used leaves instead of letters to teach them that he had again elected Aaron.”

“In the book of the prophet it is written: "Take to thyself the rod of an almond tree." We ought to consider why the Lord said this to the prophet, for it was not written without a purpose, since in the Pentateuch too we read that the almond rod of Aaron the priest, after being long laid up, blossomed. For the Lord seems to signify by the rod that the prophetic or priestly authority ought to be straightforward, and to advise not so much what is pleasant as what is expedient.”

“There is only one true high priest, as Scripture says, of whom the high priest Aaron presented a figure. For this reason his rod blossomed. Just as Aaron's rod sprouted among the Jewish people, so the cross of Christ flowered among the Gentiles. However, since Christ is the true high priest, as we have often said, he is the only one whose rod of the cross not only sprouted but also blossomed and produced the fruit of all believers.What is the fruit which it bore? "Ripe almonds." Almonds are nuts, brethren. This fruit is bitter indeed in its first covering, is protected and defended by the second, but in the third part [it] feeds and nourishes whoever eats it. Such then is knowledge of the law and the prophets in Christ's church. The first appearance of the letter is quite bitter, because it commands circumcision of the flesh, enjoins sacrifices and ordains other things which are designated as the killing letter. Throw away all these things as the bitter shell of the nut. In the second place, you will come to the protective covering, in which is indicated moral doctrine or the idea of self-restraint. This is necessary for the protection of what is kept inside but doubtless must sometimes be broken and destroyed. For example, fasting and chastisement of the body are no doubt necessary as long as we are in this corruptible body which is subject to suffering. However, when it has been destroyed and dissolved at the approach of death, it will become incorruptible at the time of the resurrection when it has been restored from corruption, spiritual after being natural, and without any flattery to the body will dominate, with no difficult suffering or propitiatory fasting but by its own nature. Thus then that rather hard covering of the nut seems to be a means of self-control at present that will not be sought later. Third, you will find hidden as in the nut the secret meaning of the mysteries of God's wisdom and knowledge. With these, holy souls are nourished and fed not only in the present life but also in the future one. This is that priestly fruit concerning which it is promised to those "who hunger and thirst for justice, for they shall be satisfied."”

“A figure preceded in the rod and flower of Aaron. The history is in the rod of Aaron, which, cut off and dry, in the space of a single night put forth leaves, flowered, and brought forth fruit. Who brought it about that the Virgin conceived? Certainly the Holy Spirit, who is a love fervent, fruitful, undefiled, virile, incorrupt, and deifying. That he is a fruitful love is signified in the rod of Aaron, which in the space of a night put forth leaves, flowered, and brought forth fruit.”