Don't limit yourself. Many people limit themselves to what they think they can do. You can go as far as your mind lets you.
Anyone can give up, it's the easiest thing ever. But to hold it together when everyone else thinks you'd fall apart is true strength.
To be successful you must accept all challenges that come your way. You can't just accept the ones you like.
The only thing that stands between a person and what they want in life is the will to try it and the faith to believe it is possible.