An outcome-focused mind
According to author Daniel Pink, "an outcome focused mind, in some sense, can set you up for failure. That is, if you don't reach the outcome, you feel lousy about yourself."
Pink argues that processes>outcomes.
If you have a good process and you work hard and it doesn't work out, that's alright. Don't stress out about it. But, if you screw up the process, then that is a different story. You'll be bummed out because you failed to execute your own good process.
Frankly, that makes an awful lot of sense to me.