I think risk is important. I don't care if it's a great financial risk or a physical risk. You only get out of something what you put into it and the fact that you are willing to risk something means that you are going to get a lot more out of it.
Success for me will be where the body of work I've done afforded me the opportunity to be as good as I can be, and to explore myself and to see what I'm capable of. People like that share a willingness to be scared and to take chances.