Earlier quoted context omitted.
I was sad to search for the word "luck" and come up empty. You can do everything right and still fail. You can do everything wrong and win. Sometimes you're just in the right place at the right time, and that external factor is completely out of your control and can be the difference you need.
I don't disagree that luck is a factor, but what can you do with that information other than console yourself when it doesn't work out?
And, in the unfortunately common case, recognize when you cannot take any bets and instead focus on getting yourself to a place where you can, rather than betting everything and losing everything.