Fear
Me: Fear is a direct outcome of hope and prosperity.
Friend: Fear is realizing your weakness and vulnerability.
Me: Hopelessness removes fear, depression removes fear.
Friend: Yes, they do, when the fear is overcome by resignation. But you resign only to those things which you know are costly but still bearable.
Me: You sometimes resign to life, and then nothing else matters. Depression can take away fear of life also.
Friend: We tend to resign on longish things, but not on spilt second things, and then you only feel primal fear. Once you have the time to rationalize that fear, you then tend to calm down and resign and become hopeless. So if you are faced with a 5 second danger, you will have intense fear, not hopelessness.
Me: hmmm, primal fear is not logical, it's instinctive. You need to put logic into it to remove it. You fear when are not prepared to defend against an attack. There must be uncertainty for fear. Certainty of either victory or defeat kills fear.