“ ‘But why couldn’t Quirrell touch me?’

‘Your mother died to save you. If there is one thing Voldemort cannot understand, it is love. He didn’t realise that love as powerful as your mother’s 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 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 good.’ “

J K Rowling
Harry Potter
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