8 Let not monks then prevent you, as though you alone had been elected from among monks; nor do you make excuses, to the effect that you will deteriorate. For you may even grow better if you imitate Paul, and follow up the actions of the Saints. For you know that men like those, when appointed stewards of the mysteries, all the more pressed forward to the mark of their high calling. When did Paul meet martyrdom and expect to receive his crown, if not after being sent to teach? When did Peter make his confession, if not when he was preaching the Gospel, and had become a fisher of men? When was Elijah taken up, if not after completing his prophetic career? When did Elisha gain a double share of the Spirit, if not after leaving all to follow Elijah? Or why did the Saviour choose disciples, if not to send them out as apostles?
Source: Letters (New Advent)