One Harry Potter Quote Became More Important With Every Book

The Harry Potter franchise is filled with unforgettable lines, from Severus Snape's loving "always" and Ron Weasley's witty quips to magical passwords like "I solemnly swear I'm up to no good" and the iconic "Wingardium Leviosa" spell. Throughout the seven books and eight films, Albus Dumbledore frequently shared wise words with Harry Potter as the Chosen One came to understand the ways of the Wizarding World, and one particular quote in The Chamber of Secrets proved to be increasingly important as the series went on.