And shouldn't our lives reflect this difference? This difference, in fact, should be (in my opinion, at least), defined by its most simple root form: holiness. (As Devin pointed out, the Greek word this word derives from is most accurately defined as 'different' or 'separate'.) We most often see this word, of course, applied toward God, someone so beyond our conception of banal existence that we can't even fathom it.
But through Christ, we have become saints, and have become credited with all the righteousness of Christ. In God's eyes, if you are redeemed, there is no difference between you and Christ. You have, to all intents and purposes, been credited with the holiness of Christ.
So how are we supposed to respond to this? How is this supposed to manifest itself?
I don't really know. But I do know that Peter talked about it quite a bit, in both of his epistles.
But as he which hath called you is holy, so be ye holy in all manner of conversation...
what manner of persons ought ye to be in all holy conversation and godliness...?
Biblically, our 'conversation' is, very simply, our testimony. It is the way other people see us. For we, as Christians, this is vitally important. 2 Corinthians 5:20 tells us we are ambassadors, and 6:3 states that we must give no offence, "that the ministry be not blamed". God may look at the heart, but people most definitely look at the outside, and what they see and hear is integral to how they perceive not just us, but our God.
Take care that your words are gentle, peaceable, kind. I know this can be the hardest thing to master, as we talked about some time ago. More than that, be sure that your actions will give no cause for question fall upon God. All manner of conversation, after all.
Wherefore gird up the loins of your mind, be sober
Looking for and hasting unto the coming of the day of God
hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ
And at the end of it, what is it that we're looking forward to? What is it that will help us achieve this holiness? Christ's coming, and Christ, quite simply. Jesus has promised to return for us, his bride. And that gives me quite a bit of hope. How can I help serving him while I am here, and singing to him an anthem of difference with my life?
*references in italics taken from 1 Peter 1:13-16 and 2 Peter 3:11-12