I desire steadfast love and not sacrifice, the knowledge of God, rather than burnt offerings" (Hos 6: 6). It is a key word, one of those that bring us into the heart of Sacred Scripture. The context in which Jesus makes it his own is the calling of Matthew, a "publican" by profession, in other words a tax collector for the Roman imperial authority: for this reason the Jews considered him a public sinner. Having called Matthew precisely when he was sitting at his tax counter - this scene is vividly depicted in a very famous painting by Caravaggio -, Jesus took his disciples to Matthew's home and sat at the table together with other publicans. To the scandalized Pharisees he answered: "Those who are well have no need of a physician, but those who are sick.... For I came not to call the righteous, but sinners" (Mt 9: 12-13). Here, the Evangelist Matthew, ever attentive to the link between the Old and New Testaments, puts Hosea's prophecy on Jesus' lips: "Go and learn what this means, "I desire mercy, and not sacrifice'". (…) God's words have come down to us, through the Gospels, as a synthesis of the entire Christian message: true religion consists in love of God and neighbour. This is what gives value to worship and to the practice of the precepts. (Pope Benedict XVI, Angelus, 8 June 2008)