... 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.
AmbroseWe must follow the ways of the Lord, and take heed to our own ways, lest they lead us into sin. One can take heed if one is not hasty in speaking. The law says: 'Hear, O Israel, the Lord your God' (Dt. 6:4). It said not: 'Speak,' but 'Hear.' Eve fell because she said to the man what she had not heard from the Lord her God. The first word from God says to you: Hear!
AmbroseAs the print of the seal on the wax is the express image of the seal itself, so Christ is the express image - the perfect representation of God.
AmbroseThe Lord Jesus himself proclaims, 'This is My Body.' Before the blessing of the heavenly words something of another character is spoken of; after consecration it is designated 'body'. He himself speaks of his blood. Before the consecration it is spoken of as something else; after the consecration it is spoken of as 'blood'. And you say, 'Amen', that is, 'It is true.' What the mouth speaks, let the mind within confess; what the tongue utters, let the heart feel.
Ambrose