Bede the Venerable — as excerpted in the Catena Aurea on Mark 2:18-22

“(ubi sup.) For He compares His disciples to old bottles, who would burst at spiritual precepts, rather than be held in restraint by them. But they will be new bottles, when after the ascension of the Lord, they are renewed by desiring His consolation, and then new wine will come to the new bottles, that is, the fervour of the Holy Ghost will fill the hearts of spiritual men. A teacher must also take heed not to commit the hidden things of new mysteries to a soul, hardened in old wickedness.”