The Lord Jesus himself ...

The 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.
 See image
 Ambrose

Quotes from the same author

Stephen prayed for his persecutors, who had not been able even to listen to the Name of Christ, when he said of those very men by whom he was being stoned: "Lord, lay not this sin to their charge" And we see the result of this prayer in the case of the Apostle, for Paul, who kept the garments of those who were stoning Stephen, not long after became an apostle by the grace of God, having before been a persecutor.
 See image
 Ambrose
The rich women, to avoid dividing the inheritance among many, kill their own fetus in the womb and with murderous juices extinguish in the genital chamber their children.
 See image
 Ambrose
And let them remember that prayer should accompany the reading of Sacred Scripture, so that God and man may talk together; for "we speak to Him when we pray; we hear Him when we read the divine saying.
 See image
 Ambrose
God is not accustomed to refusing a good gift to those who ask for one. Since he is good, and especially to those who are faithful to him, let us hold fast to him with all our soul, our heart, our strength, and so enjoy his light and see his glory and possess the grace of supernatural joy.
 See image
 Ambrose
When I go to Rome, I fast on Saturday, but in Milan I do not. Do you also follow the custom of whatever church you attend, if you do not want to give or receive scandal.
 See image
 Ambrose