What is our primary purpose. I am sorry, I didn't read Rick Warren's book, so I'll have to figure it out on my own! Some say soulwinning is our prime directive and I can see why, given Matthew 28. However, I think that there is more to it.
I believe that our goal, our Prime Directive is to be conformed to the image of Christ, per Romans 8:29. When we make that our goal, everything else fit into place, all our service is done in the right spirit. All our relationships run more smoothly.
So often we make a particular "thing" the basis for measuring our spirituality. But, since we are human, we can't really measure spirituality by deeds alone, since good deeds can be done by christians and non-christians alike. Even atheists can do good.
Year ago, we were give a Steve Green tape. On it was an awful song called "Let the walls come down" I didn't listen to that tape for years because of it. However, I began listening to the other songs, and what a treasure! Thanks to CDs I can easily skip that ecumenical mess and get to some really wonderful songs. One of them is called "I am the Vine". It has a line that has stuck with me for ages. It says "Service is never the root of devotion, It must grow as the fruit of a life that remains on the Vine"
This is in no way knocking service. In fact, it is encouraging service. However, it makes it clear about our motivation.
So, I guess I could say that our Prime Directive will depend on our Prime Motivation.