We serve a merciful God, but one who does not trifle with sin. When we come before Him, forgetful of our sins, in that self-serving and convenient way we have, He remembers them. In Hos. 8:13, when the worshipers came to offer their sacrifices, there God promised to remember their iniquity. But this is the same God who promises to forget our sins. The psalmist prays that God would not remember his sins (Ps. 25:7). As far as the east is from the west (Ps. 103:120, so far our sins are removed from us. He throws all our sins into the depths of the ocean (Micah 7:19).
So then, if we forget our sins, God does not forget them. If we remember them, confessing them (1 John 1:9), God forgets them. This is simply another way of saying that the man who worships God must do so honestly, and not be trying to work some game or other.
But this is why can come to this Table with confidence. The Table is set with the body and blood of Jesus. The body was broken for sinners, and all of us here qualify. The blood was shed for sinners, and every last one of us qualifies.
Come, and welcome, to Jesus Christ.