Part of faith is embracing a picture of what life could or will be, but isn't at the moment. That is not to say that what could be is relegated to the distant future, but just to say that it isn't in this instant. In this regard faith is sort of like living currently by rules and reality that don't exist now. Living in the moment as if what isn't in the moment is.
Now that could seem a disingenuous mantra, but I take it (at least in part) to be something of what it means to be in the world, but not of it. Without faith, all one has it what is: with faith, one embraces the sovereignty of God and the possibilities entailed therein. I do not believe Christians are meant to go about spouting positive confessions, that in truth are just false confessions (e.g. one who has a fever who says his temperature is normal is lying, not positively confessing), but neither do I believe that we should sit back and take it as if God isn't in charge and hasn't made promises to those who trust him.
We have been redeemed and translated into a kingdom where there is no sickness or death, no class or gender divisions, no racial divides and no sin. Where the light is the Lord himself and there is no cause for sorrow. Part of being God's people in the here and now is appropriating the earnest of our inheritance in the there and then. In that respect, faith is not just about slugging through the now while looking forward to a better future, but also living in the future, backwards.