Bruce Loveland's favorite Bible passage:
What good is it, my brothers and sisters, if you say you have faith but do not have works?  Can faith save you? 
If a brother or sister is naked and lacks daily food, and one of you says to them, "Go in peace; keep warm and eat your fill,"
and yet you do not supply their bodily needs,
what is the good of that? 
So faith by itself, if it has no works, is dead.
But someone will say, "You have faith and I have works." 
Show me your faith apart from your works,
and I by my works will show you my faith.
James 2:14-18 (NRSV)