Holding the mystery of the faith in a pure conscience.
They must keep hold of the deep truths of the faith with a clear conscience.
ἔχοντας τὸ μυστήριον τῆς πίστεως ἐν καθαρᾷ συνειδήσει.
echontas to mystērion tēs pisteōs en kathara syneidēsei.