4 But why is it said, He escaped? For He could not be held against His will, nor seized against His will, since He could not be recognized against His will. But that you may know that this was done mystically, not of necessity, but of express purpose, you will presently see in the following: that He appeared to the same multitudes that sought Him, said many things in speaking with them, and discoursed much about the bread of heaven; when discoursing about bread, was He not with the same people from whom He had escaped lest He should be held of them? Then, could He not have so acted at that time that He should not be seized by them, just as afterwards when He was speaking with them? Something, therefore, was meant by His escaping. What means, He escaped? His loftiness could not be understood. For of anything which you have not understood you say, “It has escaped me.” Wherefore, “He escaped again unto the mountain alone—the first-begotten from the dead, ascending above all heavens, and interceding for us.”
Source: Tractates on the Gospel of John (New Advent)