Insanity

It is not the thing that I am capable of doing or the things I have done that make me appear to be insane; but the fact that I can't help myself. I can't seem to stop what I want to be doing.

Desire

I can't tell the difference between desire and lust or want and need. Where does selfishness end and greed begins? When I desire something, do I really want it or is it just an act of having it?