I love a good Dorothy L. Sayers.

After all this time?"
"Always...

When you have seen as much of life as I have, you will not underestimate the power of obsessive love.

Snape's patronus was a doe,' said Harry, 'the same as my mother's because he loved her for nearly all of his life, from when they were children.

He didn't realize that love as powerful as your mother's for you leaves its own mark.

You are protected, in short, by your ability to love!