Heatman
Hustle-Loyalty-Respect
I have already set my life goals looking up at those principles that you listed above because they are the foundation of every successful fellow in the world today. Hopefully, I wouldn't get discouraged in life to quit because quitters are losers.
Quitters are the actual losers, so the advice which I would offer you is you should expect to have tough challenges along the way but it's how strong and determined you are that would keep you in the game and stop your quitting. So therefore, whenever to quit comes to mind, remember the success of others and use it as a motivation to spur on.