Some scribes who were Pharisees saw that Jesus was eating with sinners and tax collectors and said to his disciples, “Why does he eat with tax collectors and sinners?” Jesus heard this and said to them, “Those who are well do not need a physician, but the sick do. I did not come to call the righteous but sinners.”--Mark 2:16-17
At the Eucharist, all of us sinners are called to the feast of Jesus Christ. If you ever wonder why so many sinful folks (like me) are in the Church constantly screwing things up, just remember: everyone in the Church is a sinner. Our behavior down through the centuries, and our constant failure to live up to the ideals we preach, is thus pretty unsurprising.