God calls us to forgive one another as He has forgiven us - freely and without limit. This forgiveness is rooted in Jesus, who is that Son sent into the vineyard and who is killed by the tenants (Luke 20:9-20, the Gospel lesson for the Fifth Sunday in Lent).
Jesus tells his disciples that He was sent for this purpose: to go and preach the good news of the coming of God's kingdom to every town and village. We also are sent with a purpose in Jesus' Name: to be his instruments of grace and blessing in our particular mission field in life.