Think about what it is that drives you.  That motivates you.  That one thing that makes you want to get up earlier and go down later.  If you know what that is, keep at it and allow it to push you forward.  If you haven’t found it yet, it’s okay. Keep looking and be patient.  It’ll come.
Have the discipline to work hard even when no one is watching. It’s in those little moments that the successful rise above.
There will be moments when you are pushed to your absolute limits. It may get to the point when you feel like the world is collapsing in on you. This is important, for it is during these moments when you learn of your true capabilities and how far you can really go. You’re much stronger and resilient than you could have ever imagined.
Sometimes life will demand more from you than you believe you are capable of achieving. That’s when you need to show life who’s boss.