Without faith, there can not be hope... (Moroni chapter 7 verse 42). Charity is the greatest of them all (Moroni 7:46, see verses 42-48 for a discussion of all 3 principles).
I Karen is right, that faith in God... in his great power and love for us, is what gives us hope. But if we don't have charity, it doesn't really matter what we do have. Without charity we would have no reason to do any good,and no happiness could possibly come without doing acts of love /service for others.
That's my two cents... for what it's worth. ;)
Corine :D