I don't know

Galadriel:
Mithrandir? Why the Halfling?
Gandalf:
I don't know. Saruman believes that it is only great power that can hold evil in check. But that is not what I have found. I've found it is the small things, everyday deeds of ordinary folk that keeps the darkness at bay. Simple acts of kindness and love. Why Bilbo Baggins? Perhaps it is because I am afraid, and he gives me courage.

Transcript:

Clip duration: 78 seconds
Views: 47
Movie: The Hobbit: An Unexpected Journey
Year: 2012
Genres: adventure, family, fantasy
Summary: A reluctant Hobbit, Bilbo Baggins, sets out to the Lonely Mountain with a spirited group of dwarves to reclaim their mountain home, and the gold within it from the dragon Smaug.