I think these six principles that Piper outlines are good reminders and guidelines for looking at how we ought to interact with the world. As those saved, it is easy to fall into the trap of "I'm redeemed and therefore holier than thou...based on my own merit." Such arrogance is not only a poor testimony to the sacrifice of Christ, but a false one at that. We must not forget that apart from the blood of Christ, in terms of eternal destiny there is nothing that separates us at all from any other human being on the face of the earth. That in itself should be humbling. It is my prayer that we keep ourselves unstained from the world without forgetting what it took to remove the very stains we seek to avoid from our own selves. It took nothing less than the holy and perfect blood of a perfect Savior, Jesus Christ.
Stay clean, but don't forget who died to do your laundry,