'The enemy is fear. We think it is hate; but, it is fear.' - Gandhi.
'Inaction breeds doubt and fear. Action breeds confidence and courage. If you want to conquer fear, do not sit home and think about it. Go out and get busy.' - Dale Carnegie.
Fear is a great paralyzer. It holds you from achieving the full potential of your life. Fear comes from human basic instinct of self protection. It helps humans to avoid any necessary danger. But too much fear stiffles a person from doing any action that can promote personal growth. If you have fear of public speaking for example, the logic thinking of your brain is to avoid the circumstances as best as possible. By avoiding the thing you fear such as public speaking, you are not solving any problem . You also will not challenge yourself to grow. By doing the things you fear, you will in time conquer the fear and therefore will make you the master of your own destiny.