"Offend Dobby!" choked the elf. "Dobby has never been asked to sit down by a wizard - like an equal," Chapter 2, pg. 16
"Celebrity is as celebrity does," "fame's a fickle friend," Chapter 7, pg. 92
"Hearing voices no one else can hear isn't a good sign, even in the wizarding world."
Chapter 9, pg. 110
"Hogwarts was founded over a thousand years ago- the precise date is uncertain-by the four greatest wizards of the age
Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw and Salazar Slytherin." Chapter 9, pg. 114
"Slytherin, according to the legend, sealed the Chamber of Secrets so that none would be able to open it until his own true heir arrived at the school. The heir alone would be able to unseal the Chamber of Secrets, unleash the horror within and use it to purge the school.....