The Bible says that our basic orientation now is not what it originally was; that now our basic orientation is self-centered.  It was originally identical to God's nature which is essentially others-centeredness (based in the Trinity).  To correct this problem and all that comes from it is why Jesus came.  This word (Gospel) which means “good-news” referes to Jesus' having finished all our obligations to God, as the sole basis that makes us acceptable and adopted.  We at Redeemer believe that the message of this accomplishment by Jesus is for the non-Christian and Christian alike.  This one truth is not only the means that saves us, it is also the only means by which we grow and change.  "Believing it" means continually turning from our "make-life-work" agendas to instead rest and rely on this gospel, which then secures a better agenda (the one for which we were made) of finding God himself as our happiness.  As we wrestle to keep believing this, it begins to produce the experience of being delighted in by God, and then begins to work through us (others-centered).