Love is the answer
When you stop and look, you can always see me; if you try to touch you can't touch me; I can't move, but as you near me, I will move away from you. What am I?
I live with first ones ,they use me well! For the others I am hell! For the third ones I am useless,you can't touch me but you can see me! I am always there within you! Seek for me and and I'm right there! What am I?