Jesus disallows the interdict for a reason that goes deeper than the purely external one of the disciples = not of our company? well, but with us at heart. δυνήσεται ταχὺ : points to moral impossibility: use of Christ's name in exorcism incompatible with hostile or inappreciative thought and speech of Him. ταχὺ softens the assertion: not soon; he may do it, but it will mean a change of mind, and disuse of my name.

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Old Testament