"The art of Potion making is a very delicate and subtle science," Sev began in a whisper. His voice demanded the silence of every student in the class. "Most of you nitwits do not possess the patience or, in some cases, knowledge for this class. I am so grateful that I will not have to deal with your idiosyncrasies after your OWLs. To those with the gift, I thank you for making this hellish experience bearable. To those without...."