When the apostle Paul is writing this letter to the Colossians, he is not just talking to them about what they need to know, but explaining to them that there is great treasure beyond what they need. Having the basics may get you by enough to survive, but there is a whole treasure chest full of amazing things that God wants us to know.
The apostle Paul said that he always strived to live with a conscience void of offense toward both God and man. We also need to strive for the same thing. http://youtu.be/8rqNhvoNqNc