Peter's Sickness

Cum venisset Jesus in domum Petri, vidit socrum ejus jacentem et febricitantem, et reliqua... In socru Petri, vitiosa infidelitatis aestimatur affectio, cui adjacet libertas vountatis, quae nos quadam sibi conjugil societate conjungit. Ergo ingressu Domini, in Petri domu, id est, in corpore curatur infidelitas peccatorum calore exaestuans, et vitiorum aegra dominatu. Mox deinde sanata, officii famulatu ministrat. Nam primus credidit, et apostolatus est princeps: et quod in eo ante languebat, Dei verbo invalescens ministerio tamquam publicae salutis operatum est. Recte autem hanc ex socru Petri similitudinem ad affectionem infidelitatis aptari, loco qui de nuru et socru consequitur tractabimus. Nunc autem ideo infideliatis socrus Petri nuncupabitur, quia usque dum credidit, voluntatis suae servitio detinebatur. Sanctus Hilarius Pictaviensis, In Evangelium Matthaei Commentarius, Cap VII

When Jesus had come into the house of Peter, he saw his mother in law thrown down by a fever... 1 In Peter's mother in law we should understand a diseased affection of disbelief that is linked with freedom of will, and it binds us to her in familial association. Thus with the entry of the Lord into the house of Peter, that is, into the body he cured, the unbelief of those burning in the heat of their sins and  ruled by the sickness of vices. Soon after, being healed, she ministers in the office of a servant. For he was the first to believe and is the prince of the Apostles, and even if before in this he was weak, he was fortified by the ministry of the Word of God, working for the common salvation. Rightly then is this tale of Peter's mother in law used for the disposition of infidelity, which we will consider in later place with the daughter and mother in law. Now indeed we will announce disbelief as Peter's mother in law because as much as he did believe the servitude of his will detained him Saint Hilary of Poitiers, from the Commentary On The Gospel Of Saint Matthew, Chapter 7 1 Mt 8.14