This day commemorates the Passover when the blood of lambs on doorposts saved a bunch of slaves. This is also the day on which Jesus Christ acts as our host and welcomes us to the meal he provided at his last Passover. This is the day when only people who have missed the bullseye of the target God has set up for us (sinned) need receive his body and blood in the bread and wine. This is the day when Jesus shared the meal with his betrayer, his denier, with those who would abandon him.
If anyone believes they are just fine and has their act together they need to go back and read the confession, “We have sinned against You in thought, word and deed, by what we have done and left undone. We have not loved You with our whole heart; we have not loved our neighbor as ourselves.” This is the day God welcomes only broken people who hope that Jesus words, “This is my body given for you…this cup that is poured out for you,” includes them also. As Martin Luther wrote, “That person is worthy and well prepared who has faith in these words; ‘given and shed for you for the forgiveness of sins,’” even if that faith is smaller than a lettuce seed.