It shows us the error of the church at Colossae. 2:6-23 Many people believe this is why Paul wrote this letter? Most scholars believe this book was written to counter false teaching. However this is not clear. However in chapter 2 of this book we see warnings about not being deceived, and talks of empty deceit, and truths that are contrary to the teachings of Christ. What else where they teaching? in Chapter 2 verse 18 it says, Let noone disqualify you, insisting on asceticism and worship of angels, going on in detail about visions, puffed up without reason by sensuous mind. Many believe the Colossian heresy was basically Jewish, it is not the straightforward Judaizing legalism of Galatians that is envisaged in Colossians, but a form of mysticism which tempted its adepts to look on themselves as a spiritual elite. The people of Colossae could have been influenced by others injecting truth that did not pertain to the true gospel. So Paul lays out truth throughout his letter to eliminate the ideas, that Christ is not enough for salvation, or enough to be godly followers of Christ. Any teaching that questions the sufficiency of Christ not only for initial salvation but also for spiritual grown and ultimate salvation from judgment, fails to preach the truths of scripture.