"But you will find that even those who insist most strongly on the importance of good actions tell you you need Faith; and even those who insist most strongly on Faith tell you to do good actions."

The Book of James (begin reading it here) is a treatise on the relationship of faith to works.

James 2:17-18 (ESV): "So also faith by itself, if it does not have works, is dead.  But someone will say, 'You have faith and I have works.' Show me your faith apart from your works, and I will show you my faith by my works."