Nothing.

Nothing.
In any city, in any country, go to any mental institution or halfway house you can get yourself to. When you reach the front desk, ask to visit someone who calls herself "The Holder of Nothing." Should the worker loose all sign of any emotion, the worker will proceed to lead you to an old wooden outhouse. Inside will be a seemingly endless corridor far, far longer than the length of the outhouse.
The corridor will be completely silent. Any attempt of vocalizations will not work. You vocal chords will be tangled, footsteps will be unheard and the sound of breathing will not be audible. Soon you will feel numb if you continue following the worker. You vision will begin to fade to black. Keep walking. You can not see, hear or feel. You will feel nothing. You are nothing. Soon your sense vision will have returned, and the worker will point to a wooden door, open it, there is no going back now. 
The door opens to a blank room. There is nothing in the room, just a vast expanse of white. If you walk far enough you will see a shape that resembles a human. Walk to it. Ask it "What were they when they were one?" It will not answer you but send you outside the mental institution or halfway house you first entered. Run back home. You cannot go back. Do not look back. Accept the object you got. Sometimes life's just not fair, Accept that.
They desire to be one again, but they mustn't.