“There is not enough darkness in all the world to put out the light of even one small candle.” – Robert Alden
A lit candle was often placed in the window when a family member was away or who had died to remember them, letting them know they are missed. It was also seen as a silent prayer for the safe return of the absent person and a sign that someone remained at home tending the fire and waiting. ref>
Creedence Clearwater Revival - Long As I Can See The Light - yt