52 Then Mary received her firstborn and went forth. He was outwardly wrapped in swaddling clothes, but secretly He was clothed with prophecy and priesthood. Whatsoever then was handed down from Moses, was received from Simeon, but continued and was possessed by the Lord of both. So then the steward first, and the treasurer lastly, handed over the keys of priesthood and prophecy to Him who has authority over the treasurer of them both. Therefore, His Father gave Him the spirit not by measure, because all measures of the spirit are under his hand. And that our Lord might show that He received the keys from the former stewards, He said to Simeon: To you I will give the keys of the doors. But how should He have given them to another, had He not received them from another? So, then, the keys which He had received from Simeon the priest, them He gave to another Simeon the Apostle; that even though the People had not hearkened to the former Simeon, the Gentiles might hearken to the latter Simeon.
Source: On Our Lord (New Advent)