According to an article in Today in the Word, soon after Queen Victoria's marriage to Prince Albert, the couple had a quarrel, whereupon Prince Albert locked himself in his private apartment. Queen Victoria knocked furiously on his door.
"Who's there?" asked Albert.
"The Queen of England, and she demands to be admitted."
There was no response and the door remained locked. The queen knocked furiously again.
"Who's there?" asked Albert again. The queen's response was the same … as was Albert's.
After more furious knocking and no response came a quiet pause—and then a gentle tap.
"Who's there?" asked Albert once more.
"Your wife, Albert," the queen replied. Immediately the door was opened.
As the writer of this article pointed out, "Love opens doors."