Jesus contrasts two ideas here:
- the difference in knowledge between one who learns one who teaches and,
- the difference in authority between a slave and his owner.
He contrast the same Greek terms in a number of other verses making this same point.
In the earlier verse, Matthew 10:22, the word "under" or "beneath" was emphasized. In this verse, the focus on its opposite, "above." Followers were beneath in that verse and their master is above them in this verse.
Christ's Words in Matthew as a Guide to 40 Days of Prayer.