Augustine of Hippo — as excerpted in the Catena Aurea on John 6:15-21

“(de Con. Ev. ii. c. xlvii) This is not at all inconsistent with what we read, that He went up into a mountain apart to pray: (Mat. 14:23) the object of escape being quite compatible with that of prayer. Indeed our Lord teaches us here, that whenever escape is necessary, there is great necessity for prayer.”