Καλῶς ἐποίησας ἐπιστομίσαι τὰς ἀῤῥήτους διδασκαλίας τῶν Καρποκρατιανῶν."ἐπιστομίσαι." The correct form of the verb would be "ἐπιστομίσας" to agree with the subject "σύ" understood from the context. So, the correct form would be:
"Καλῶς ἐποίησας ἐπιστομίσας τὰς ἀῤῥήτους διδασκαλίας τῶν Καρποκρατιανῶν."
"You did well to muzzle the secret teachings of the Carpocratians"
dating back to conversations with his grandfather, Gaston Frank. "He said we represent one of the last descendants of the Frankist Jewish faith in the world," he muses. "I grew up thinking that our family was something like the Last of the Mohicans."