This memory is everything.
Read more Professor Albus Dumbledore QuotesFrom: Harry Potter and the Half-Blood Prince (2009)
Please don't think badly of me when you see it. You have no idea what he was like... even back then.
Every day. Every hour. This very minute, in fact, dark forces attempt to penetrate these walls. This time, I cannot help you destroy it... alone.
Without this memory, it leaves the fate of our world to chance. You must not fail.