However, I'm not advocating a cynical mindset. I'm advocating a compassionate one, and a realistic one. If you don't think luck matters, you can delude yourself into thinking the people below you didn't work hard enough, or that you must be especially talented and driven to have gotten where you are.
I've also seen people hurt themselves with that mindset. The guy who risks everything on some business venture that's doomed to fail, yet he thinks he can beat the odds because he's smarter or more hard-working.
How about having an absurdist approach towards luck. "I'm probably going to fail, and I'm going to do it anyway." It's honest, it's compassionate, and it doesn't discourage you from trying the impossible. That's how I think, and it's worked well for me.