ANSWER: The visible presence of supernatural power produces an instinctive chill in the spinal column, such as the sudden appearance of one known to be dead and buried, entering the room without opening the door, probably bloodless and pale as a ghost (see Bengel on Heb. 12:24,) in mysterious robes. This would startle the most courageous men. In the case of two disciples it is said "their eyes were holden (restrained) that they should not see him." (2) We do not know when his body met with the change called glorification. It is probable that it took place after his ascension. The only one who has since seen him was Saul near Damascus. The vision of dying Stephen and that of John in the Revelation were subjective, or in a trance. Christ's glorified person is too dazzling for mortals to see. It almost killed Saul.
— Steele's Answers p. 157.