John Chrysostom
Mark, aiming to indicate the timing, notes: and immediately (Mark 1:30); whereas Matthew focuses solely on the miracle, omitting any mention of the timing. Some suggest the afflicted woman approached Him herself; however, Matthew does not record this detail either. Nonetheless, there is a consensus on this point: one narrative displays brevity, while the other exhibits thoroughness. But what was the reason for Christ entering Peter's abode? It is my belief that it was for the purpose of dining, as the evangelist implies when stating, ‘He went up, and served Him.’ Christ spent time in companionship with His disciples, similar to His relationship with Matthew at the time of his calling, to honor them and encourage their diligence. Notably, Peter showed his reverence for Christ as well.
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With his mother-in-law suffering from a severe fever at home, he did not invite Him in until the teaching concluded and all others were healed. Only then did he approach Him. This reveals that he learned early on to prioritize the welfare of others over his own needs. Therefore, it was not Peter who ushered Him into the house; rather, Christ chose to enter freely, especially after the centurion expressed, ‘I am not worthy that thou shouldest come under my roof,’ thus demonstrating His favor towards the disciple. Consider what the homes of those fishermen might have looked like; yet, Christ did not shy away from stepping into their humble dwellings, teaching us to forsake human pride in all situations. At times He heals merely with His words, at other times He lays hands on the afflicted, and occasionally He employs both methods so that His healing power is made manifest. He did not always seek to perform miracles in a remarkable manner. Still, He needed to maintain a degree of concealment, particularly from His disciples, knowing they would share the news with great enthusiasm. This is evident when He ascended the mountain and deemed it necessary to instruct them not to disclose anything to anyone.