I remember hearing someone once say she knew Christians were supposed to be light, but she knew her light was sometimes too dim! But the dimmest light, in utter darkness, looks blinding. And to wandering folk, who can't see the way ahead, that may be the very thing they need. Also, too many Christians want to be spotlights on stage or useful guiding lights on airport runways or at least decorative lights. Few want to be rusty dusty dim-and-dingy old lanterns hanging from tree branches.
If you look closely, tho', a myriad of insect friends seem glad someone left the light on for them.