Harry, I'd like you to meet Professor Horace Slughorn.
Read more Professor Albus Dumbledore QuotesFrom: Harry Potter and the Half-Blood Prince (2009)
Without this, it leaves the fate of our world to chance.
This memory is a different kind of magic. Very dark. Very parcel. Without it, we are blind. It leaves the fate of our world to chance. You have no choice, you must not fail. Once again, I must ask too much of you, Harry.
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.