Luke 22:43

And there appeared unto him an angel from heaven, strengthening him.

This marvelous detail which explains so much which would be otherwise unknown was supplied only by Luke. Commentators have attempted to make a great point out of the contrast in Jesus' demeanor in the Johannine account and that of the synoptics. In John, the Lord's majestic appearance prostrated a whole company of soldiers on their faces; in the synoptics, he appears in utter weakness, agony, and even fear. This verse harmonizes both pictures of our Lord, the synoptics giving his state BEFORE the strengthening of the angel, and John giving it AFTER the angel's mission was completed.

Strengthening him ... Hobbs noted that "this has primary reference to physical strength."[24] Just as angels came and strengthened Jesus following his temptation in the wilderness, an angel was ready here to provide that physical strength without which Jesus might have died before the time. "A divine refreshing pervaded him, body and soul; and thus he received strength to continue to the last in the struggle."[25]

[24] Herschel H. Hobbs, op. cit., p. 312.

[25] H. D. M. Spence, op. cit., p. 203.