One of my favorite books is Lone Survivor by Marcus Luttrell.  As he’s going through Navy Seal training, he talks about Rear Admiral Maguire, Commander, SPECWARCOM.  The advice Captain Maguire gave Marcus and the other men applies to all of us.

First of all, I do not want you to give in to the pressure of the moment.  Whenever you’re hurting bad, just hang in there. Finish the day. Then, if you’re still feeling bad, think about it long and hard before you decide to quit.  Second, take it one day at a time. One evolution at a time.

Don’t let your thoughts run away with you, don’t start planning to bail out because you’re worried about the future and how much you can take. Don’t look ahead to the pain. Just get through the day, and there’s a wonderful career ahead of you.”