St. John Chrysostom (c. 347-407), Hom. in Matt., xiii: Because all that Christ did and suffered was for our teaching, He began after His baptism to dwell in the wilderness, and fought against the devil, that every baptized person might patiently sustain greater temptations after His baptism, and not be troubled, as if what happened to Him was contrary to His expectation, but might bear up against all things, and come off conqueror. For although God allows that we should be tempted for many other reasons, yet for this cause also He allows it, that we may know, that man when tempted is placed in a station of greater honour. For the Devil does not approach except where he has seen someone set in a place of greater honour; and therefore it is said, “And immediately the Spirit drove Him into the wilderness.” And the reason why He does not simply say that He went into the wilderness, but was driven, is that you may understand that it was done according to the word of Divine Providence. By which also He shows that no man should thrust himself into temptation, but that those who from some other state are as it were driven into temptation, remain conquerors.
The Venerable Bede (672/3-735): But He was tempted forty days and forty nights that He might show us that as long as we live here and serve God, whether prosperity smile upon us, which is meant by the day, or adversity smite us, which agrees with the figure of night, at all times our adversary is at hand, who ceases not to trouble our way by temptations.
Consider also that Christ dwells among the wild beasts as man, but, as God, uses the ministry of Angels. Thus, when in the solitude of a holy life we bear with unpolluted mind the bestial manners of men, we merit to have the ministry of Angels, by whom, when freed from the body, we shall be transferred to everlasting happiness.