This tiny ball of light appeared. And I knew.
A warmth was spreading through him that had nothing to do with the sunlight; a tight obstruction in his chest seemed to be dissolving. He knew that Ron and Hermione were more shocked than they were letting on, but the mere fact that they were still there on either side of him, speaking bracing words of comfort, not shrinking from him as though he were contaminated or dangerous, was worth more than he could ever tell them.
We’ve all got both light and dark inside of us. What matters is the part we chose to act on, that’s who we really are.
Harry and Hermione in Deathly Hallows Part 1