Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. He didn't realise love as powerful as your mother's love for you leaves its own mark. Not a scar, no visible sign... to have been loved so deeply, even though the person who loved us is gone, will give us some protection forever. It is in your very skin. Quirrell, full of hatred, greed and ambition, sharing his soul with Voldemort, could not touch you for this reason. It was agony to touch a person marked by something so good.
— Harry Potter and the Philosopher's Stone
by J.K Rowling