Commentaries:
Robertson's Word Pictures (NT)
Epileptic (selhniazetai). Literally, "moonstruck," "lunatic." The symptoms of epilepsy were supposed to be aggravated by the changes of the moon (cf. Matthew 4:24).
He has it bad (kakwv exei) as often in the Synoptic Gospels.
Other Robertson's Word Pictures (NT) entries containing Matthew 17:15:
Matthew 4:24
Mark 9:14
Luke 9:38
Luke 9:39
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