It was God's purpose to bring us into being [spiritually] by the message of truth, so that we could become a kind of "firstfruits" of those He created. [Note: "Firstfruits" here suggests either that Christians are the best of all of God's creatures (Num. 18:12), or that they were the first to be converted, with many more to come].

For, whoever observes the entire law [of God] and yet breaks one requirement [of it], becomes guilty of [breaking] all of it.

For God, who said [through Moses, Ex. 20:13f], "You must not be sexually unfaithful to your mate," also said, "You must not murder." Now if you are sexually faithful to your mate and yet murder [someone], you have become a lawbreaker.

You people who have become unfaithful to God, do you not know that being [intimate] friends with the world [of sin] means hostility toward God? Therefore, whoever determines to be an [intimate] friend of the world becomes an enemy of God.

that person should know that whoever brings a sinner back from the error of his way will save that soul from [spiritual] death and will cover over a large number of sins [i.e., the many sins of that person will become forgiven].