If somehow you are able to overcome your fears or phobias such as public speaking or snakes, does that mean you will be more successful in life than you were before overcoming your fears?
And if you have *nothing *to fear (at least not in this world) does that automatically mean success?
Reminds me of a saying that goes "there is nothing to fear but fear itself". I think overcoming one's fear helps obe to be successful, among other obvious factors such as aptitude, smarts etc.