“Harry,” she said timidly, “don’t you see? This . . . this is exactly why we need you. . . . We need to know what it’s r-really like . . . facing him . . facing V-Voldemort.”
It was the first time she had ever said Voldemort’s name, and it was this, more than anything else, that calmed Harry.

Harry Potter and the Order of the Phoenix – J.K. Rowling