It is Peter himself that He says, 'You are Peter, and upon this rock I will build my Church.' Where Peter is, there is the Church. And where the Church, no death is there, but life eternal.
Ambrose... the Apostle Peter declared that the Church was built by the Holy Spirit. For you read that he said: 'God, Who knows the hearts of men, bore witness, giving them the Holy Spirit, even as was given to us; and He made no distinction between us and them, purifying their hearts by faith' (Acts 15:8-9). In which is to be considered, that as Christ is the Cornerstone, Who joined together both peoples into one, so, too, the Holy Spirit made no distinction between the hearts of each people, but united them.
AmbroseDo not desert a friend in time of need, nor forsake him nor fail him, for friendship is the support of life. Let us then bear our burdens as the Apostle has taught (cf. Gal. 6:2): for he spoke to those whom the charity of the same one body had embraced together. If friends in prosperity help friends, why do they not also in times of adversity offer their support? Let us aid by giving counsel, let us offer our best endeavors, let us sympathize with them with all our heart.
Ambrose