J.k. Rowling said this quote

Things we lose have a way of coming back to us in the end, if not always in the way we expect.

~ J.k. Rowling

After all this time?Always...

~ J.k. Rowling

Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. Love as powerful as your mother's for you leaves it's own mark. To have been loved so deeply, even though the person who loved us is gone, will give us some protection forever.

~ J.k. Rowling

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.

~ J.k. Rowling