{It is enough} (apechei). Alone in Mark. This impersonal
use is rare and has puzzled expositors no little. The papyri
(Deissmann's _Light from the Ancient East_ and Moulton and
Milligan's _Vocabulary_) furnish many examples of it as a receipt
for payment in full. See also  Mt 6:2ff.  Lu 6:24  Php 4:18  for
the notion of paying in full. It is used here by Jesus in an
ironical sense, probably meaning that there was no need of
further reproof of the disciples for their failure to watch with
him. "This is no time for a lengthened exposure of the faults of
friends; the enemy is at the gate" (Swete). See further on 烘t
26:45| for the approach of Judas.