According to Madam Pomfrey, thoughts could leave deeper scars than almost anything else.
J. K. RowlingWhat happened down in the dungeons between you and Professor Quirrell is a complete secret, so, naturally the whole school knows.
J. K. RowlingHarry ran upstairs to their dark dormitory. He pulled out the cloak and then his eyes fell on the flute Hagrid had given him for Christmas. He pocketed it to use on Fluffy — he didn’t feel much like singing.
J. K. Rowling