If you don't believe in yourself you will not make anything good happen. if you believe you can do it and never give up, you WILL make it. You cannot succeed in life if you believe you will not succeed in life.
The meaning is that if you have a negative outlook on your self or your life you can not live a positive life. A positive mindset leads to a positive life. In life you must try to make the most of things and try to be positive.
