Titles. They're really quite pointless. But that's one invention we can't blame on Judaism.

I'm convinced it's possible to be in the world but not of it, but also, in the world and being ...no where, really.

As Christians, several excuses arise as to why this world isn't our problem. 1) eternity... and that's all of the "several excuses".
Also, because of a pre-destined will of God. Since God has everything written out in His book already, there is little to no reason why we should intercede or petition for ourselves.
Take 1 Peter, for instance. If someone is already chosen by God, and has been chosen by God since the beginning of time, then there's nothing our prayers or witnessing are going to do that could help the process. (And it could work both ways- there's nothing our public sins could do to discourage them from following Christ)

However, we know that's not true- the affect isn't true, at least, though the theology behind being chosen by God is. Right? This is all fairly elementary, of course, and any of us who have acknowledged hopelessness in our thoughts have had to deal with that temptation.

And that's just what it is- a temptation to sway us from prayer and witnessing.

The interesting thing I'm discovering as we continue our bible study on prayer-- satan doesn't worry to tempt us so much about sinful thoughts, waste of time, violent actions, and the like. If he were to delegate his demon legions out for different tasks, I'm pretty sure he'd appoint the "lesser demons"... where is my folksy knowledge when I need it. But the things that we who strive to love Jesus "want" to do- spend time in prayer, reading the bible, meditation, witnessing- Satan tries his hardest to pull us away from those things.

So, as with everything, being in the world, but not of it... that's hardly black and white. we can be in the world, not of it, and still not growing any closer to Christ. Most often the snares that catch my feet are the things I presume will help me in my Christ/child relationship- this, for example: thinking and philosophizing and analyzing. Whereas quiet... and emphasis on quiet, what with all the music and media that goes on in my head... time in prayer and meditation on his word (a rather black and white philosophy in itself) goes a lot farther for preparing me in the day.

Because, the truth is, at the beginning and the end of the day, my accomplishments rarely make me feel better than my wastes of time. Maybe... the specifically Buddhist practice of meditation can be partially applicable in the Christian faith, but not to the point where we clear our minds of all things. Maybe just until the face of God is all we see.