Well... when it comes to me, sometimes it's hate which keeps me strong. What do I mean? Well...
There's some people, who appeared in my life, whom I hate with burning passion. Although I do not wish them death or anything, I still loathe them.
Through this hate however, I managed (kinda) to keep myself from breaking completely over what those people did to me. Well, it's hard to explain, but for simplicity let's say my desire to be better than them, which fueled my hate, helped me get through though times.
Of course, it's not like I'm hatin' all the time, and I assure you, my hate for those people is completely justified (unlike the things THEY did to me).
Whatever.