Slughorn's Hesitance and Riddle's Hunger for Knowledge

PAGES: 497-498

As Riddle presses for more details, Slughorn becomes visibly uncomfortable, explaining that splitting the soul through murder is a terrible act against nature. Despite this, Riddle's excitement is palpable as he asks how a wizard might make multiple Mystery - Lord Voldemort's Horcruxes, referencing the magical significance of the number seven.