IF there's no Sun, I still can have the Moon ;
If there's no Moon, the Stars my needs suffice ;
And if these fail, I have my Evening Lamp ;
Or, Lampless, there's my trusty Tallow Dip ;
And if the Dip goes out, my Couch remains,
Where I may sleep and dream there's Light again.
John Kendrick Bangs
http://www.poemhunter.com/poem/philosophy-24/