I have a chocolate stain on the front of my (white!) shirt today. It's a mark left by our 1 1/2 year old where he kissed my tummy in order to kiss the "new-new baby." It's a lot like those little perfect handprints you find on glass windows - you almost can't bear to wash them off.
It reminded me of how often our own attempts to express our faith and love to God inadvertantly leave smudges on His holiness. With the love of a parent, He understands our intent. Then He leans down to wipe up our dirty faces.