The house of Israel is the vine of God -who planted and watered it, preparing the Israelites to bear fruits of righteousness (see Isaiah 5:7; 27:2-5).

Israel failed to yield good fruits and the Lord allowed His vineyard, Israel's kingdom, to be overrun by conquerors (see Psalm 80:9-20). But God promised that one day He would replant His vineyard and its shoots would blossom to the ends of the earth (see Amos 9:15; Hosea 14:5-10).

Mercy and forgiveness should be at the heart of the Christian life.

Yet, as today's First Reading wisely reminds us, often we cherish our wrath, nourish our anger, refuse mercy to those who have done us wrong. Jesus, too, strikes close to home in today's Gospel, with His realistic portrayal of the wicked servant - who won't forgive a fellow servant's debt, even though his own slate has just been wiped clean by their Master.

As Ezekiel is appointed watchman over the house of Israel in today's first Reading, so Jesus in the Gospel today establishes His disciples as guardians of the new Israel of God, the Church (see Galatians 6:16).

He also puts in place procedures for dealing with sin and breaches of the faith, building on models of discipline prescribed by Moses for Israel (see Leviticus 19:17-20; Deuteronomy 19:13). The heads of the new Israel, however, receive extraordinary powers - similar to those given to Peter (see Matthew 16:19). They have the power to bind and loose, to forgive sins and to reconcile sinners in His name (see John 20:21-23).

Today's First Reading catches the prophet Jeremiah in a moment of weakness. His intimate lamentation contains some of the strongest language of doubt found in the Bible. Following God's call, he feels abandoned. Preaching His Word has brought him only derision and violence.

But God does not deceive - and Jeremiah knows this. He tests the just (see Jeremiah 20:11-12), and disciplines His children through their sufferings and trials (see Hebrews 12:5-7).