We so often forget how strong we are. You know why? Because strength is hard--it's hard-won, and it's hard to maintain for extended periods of time. But it's those marathons of strength--the ones that leave us exhausted and in need of long recovery--that we remember best.
Well, of course we don't want to live those again, and of course we think of them with trepidation, in fear of their recurrence. But what we forget is that we have successfully won every day we've lived through--and life ain't for sissies, man. Every single one of us has what we need to get ourselves up, move through our days (to do so gracefully is optional), and to thank both our guides/gods/powers and ourselves for navigating our course once more.
To do anything more, we must first realize that we can do anything.