Bringing this up from the archive; #domesticviolence was an actual thing for us. (Really, really.)
I love you, my dear, every time I go
You have a way to let me know
No matter how upset I may be
I know when I return, I can always see
That signal waiting home for me
Welcoming me home with light so low
That sign so warm, that candle in the window.
A candle in the window like this always let me know that it was okay to come home, after an argument.