Harry sat in the common room by himself late at night. For some reason he couldn't sleep, so he'd come down there to clear his head. Somehow, the number seven came into his mind. Harry thought it was funny how the Wizarding World practically cherished that number. For a reason unknown to him, seven was the most magical and powerful number there was. When Harry really thought about it, it really showed that wizards believed that. At Hogwarts, there were seven years and seven floors. There also were seven secret passage ways out of the school. Hermione had told him that seven is the age that people show their magical abilities. In his first year, there were seven chambers he needed to get through in order to stop Quirrel. His girlfriend Ginny Weasley was the seventh child, and the only girl to be born in seven generations. There are seven Quidditch players on one team. Finally, Voldemort split his sole into seven different pieces.

The last example gave Harry's the chill's. Harry had to make sure all of those seven pieces were destroyed, the last one being Voldemort himself. Harry whipped that thought out of his head, it wouldn't help him fall asleep thinking of that. Instead he started to think about his girlfriend and how she fit into the number seven category. Those thoughts were the thoughts that lulled Harry to sleep.

Another reason that Harry did not know that proved why the number seven was the most magical and powerful, was that Harry was born at the end of the seventh month. The chosen one, who was the only person able to stop Voldemort and officially end the war, was the person who was born in July, the seventh month of the year.