John Chrysostom

"Let a man so account of us, as of ministers of Christ, and stewards of the mysteries of God." After he had cast down their spirit, mark how again he refreshes it, saying, "as ministers of Christ." Do not thou then, letting go the Master, receive a name from the servants and ministers. "Stewards;" saith he, indicating that we ought not to give these things unto all, but unto whom it is due, and to whom it is fitting we should minister.

Homily on 1 Corinthians 10 ↗

Theophylact of Ohrid

We who are teachers are nothing other than servants; why then do you, having forsaken the Master, call yourselves by the names of us, the servants? By calling the apostles and teachers stewards of the mysteries, he showed that the teaching should not be imparted to everyone indiscriminately, but to the one, then, and in the way to whom, when, and how it ought to be. Mysteries, as mysteries, should not be disclosed to everyone; this is not characteristic of a prudent steward.

Commentary on 1 Corinthians ↗

Thomas Aquinas

Having rebuked the Corinthians for glorying in certain ministers, the Apostle now attacks them for looking down on other ministers. In regard to this he does two things: first, he censures their guilt; secondly, he concentrates on correcting them (v. 14). In regard to the first he does two things: first, he censures their rashness in judging ill of ministers; secondly, their arrogance in looking down on ministers of Christ (v. 6). …

Commentary on 1 Corinthians ↗