O Timothy, keep that which is committed to your trust, avoiding profane and vain utterances, and oppositions of what is falsely called knowledge:
All Commentaries on 1 Timothy 6:20 Go To 1 Timothy 6
Tertullian of Carthage
AD 220
The same madness, in their allowing indeed that the apostles were ignorant of nothing, and preached not any (doctrines) which contradicted one another, but at the same time insisting that they did not reveal all to all men, for that they proclaimed some openly and to all the world, whilst they disclosed others (only) in secret and to a few, because Paul addressed even this expression to Timothy: "O Timothy, guard that which is entrusted to thee; "