But Jesus said,
Forbid him not: for there is no man who shall do a miracle in my name, that can soon after speak evil of me.
All Commentaries on Mark 9:39 Go To Mark 9
Augustine of Hippo
AD 430
We ought not be disturbed because some who do not belong or do not yet belong to this temple, that is, among whom God does not or does not yet dwell, perform some works of power, as happened to the one who cast out devils in the name of Christ. Although he was not a follower of Christ, Christ ordered that he be allowed to continue because it gave a valuable testimony of his name to many…. The centurion Cornelius also saw the angel that was sent to him to say that his prayers had been heard and his alms accepted, even before he was incorporated into this temple by regeneration. Letter , To Dardanus