When he invented the pencil eraser, British engineer Edward Nairne was reaching instead for a piece of bread. Crusts of bread were used then, in 1770, to erase marks on paper. Picking up a piece of latex rubber by mistake, Nairne found it erased his error, leaving rubberized “crumbs” easily swept away by hand.

With us too the worst errors of our lives can be swept away. It’s the Lord—the Bread of Life—who cleans them with His own life, promising never to remember our sins. “I, even I, am he who blots out your transgressions, for my own sake,” says Isaiah…