Gregory the Dialogist

(Hom. xxiv.) By holding this last feast with seven disciples, he declares that they only who are full of the sevenfold grace of the Holy Spirit, shall be with Him in the eternal feast. Time also is reckoned by periods of seven days, and perfection is often designated by the number seven. They therefore feast upon the presence of the Truth in that last banquet, who now strive for perfection.

It appears from these words that, if one who is able refuses to feed the sheep of almighty God, he shows that he does not love the chief Shepherd. For if, in order to accomplish the good of all, the Only Begotten of the Father came forth from the concealment of the Father into our midst, what shall we say if we prefer our privacy over the good of our neighbors? And so, rest is to be desired by us with all our heart. And yet for the advantage of many it should sometimes be laid aside. For, as we ought with full desire to fly from occupation, so, if there should be a lack of anyone available to preach, we need to put a willing shoulder under the burden of occupation. And this we are taught by the conduct of two prophets [Jeremiah and Isaiah], one of whom attempted to shun the office of preaching, while the other desired it.