first John

so, i have been reading in first John tonight and i must say i just love it. i do not think there is any other book we can go to and see God lay out what it means to be "in the faith". not only do we get a rich definition of Christendom, we also get a lot of "if this" "then this", meaning if you do this one thing the out come will be this other thing. leaving nothing to question and clearing up one issue after another. we see John talking about Love, and the new birth, as well as sin and perseverance. if any one out there is worried about whither or not you are in the faith, i suggest this book of the bible to you as a measuring rod of true spirituality.