In the grand scheme of things, fear brings some balance to the human mind. It's necessary and useful in certain aspects of our lives. Learning to understand what makes fear and acting accordingly can be a weapon when handled properly.
I am fearful of certain things in my life at the moment, but to some degree it's a good thing as it makes me want to solve my problems sooner rather than being complacent.
For someone who has been physical and mental emaciating, I can tell you that I've never been more scared in my entire life than the past 3 months. To me, it halts and makes you stop living