Origen

Some may say that a great multitude came, because of the great multitude of those who already believed, who, they feared, might rescue Him out of their hands; but I think there is another reason for this, and that is, that they who thought that He cast out dæmons through Beelzebub, supposed that by some magic He might escape the hands of those who sought to hold Him. Even now do many fight against Jesus with spiritual weapons, to wit, with divers and shifting dogmas concerning God. It deserves enquiry why, when He was known by face to all who dwelt in Judæa, he should have given them a sign, as though they were unacquainted with His person. But a tradition to this effect has come down to us, that not only had He two different forms, one under which He appeared to men, the other into which He was transfigured before His disciples in the mount, but also that He appeared to each man in such degree as the beholder was worthy; in like manner as we read of the manna, that it had a flavour adapted to every variety of use, and as the word of God shews not alike to all. They required therefore a sign by reason of this His transfiguration.