Doctrine is Important
The Christian life is not based on ignorance but knowledge, and the better we understand Bible doctrine, the easier it is to obey Bible duties. When people say, "Don't talk to me about doctrine-just let me live my Christian life!" they are revealing their ignorance of the way the Holy Spirit works in the life of the believer. "It makes no difference what you believe, just as long as you live right" is a similar confession of ignorance. It does make a difference what you believe, because what you believe determines how you behave!
From Writings on Ephesians