“There is nothing above the folly of men,” whispered the voice from the emptiness. “There is nothing beyond the destructive powers of sufficiently intelligent idiocy, not even the stars themselves.

“The Sun is very large, after all; I doubt the Dementor would have much effect on it. But it is not a test I would like to try, Mr. Potter, just in case.”

“Is the Sun still in the sky?” said Professor Quirrell, still with that strange gentleness. “Is it still shining? Are you still alive?”

The destruction of the sun is a recurrent theme with Quirrell.