We Shall Overcome

They say that all things can be overcome, whoever They are. The longer I think about it the more I think that this is just another comforting lie. Not everything can be overcome, and I think that there’s something comforting about that, too. If everything can be overcome, then the fault lies only in myself when I can’t seem to get over things. And that’s my hallmark, really, not getting over things.
I keep trying, though. There’s a strength in not giving up, despite the odds against you. There’s a strength in knowing your limits, though, and I’m conscious of this as well. I won’t push any further than I know I can safely push.
At what point do you have to acknowledge that your faults are a part of who you are, and that perhaps they are meant to be there? It gets trickier still when you’re unsure which parts of you are truly faults. The hardest part of self-improvement is determining which parts need the fixing.
It seems that some of the parts of me that are most onerous are the parts that I can’t seem to fix. Load-bearing structures in my personality, but they just serve to make myself and those around me unhappy. They’re strong, though, goddamn it. Without some of the problem areas in me, I wouldn’t have been able to muddle through.
When does confidence become arrogance, when does determination become bullheadedness?
When does righteousness become zealotry?