Yuna has always been one of my favourite characters too. She's a perfect distillation of that admirable personality that comes from rock solid principles and real dedication (lets ignore X-2 where she's just a bit all over the place). She's a good person in every possible way without it becoming too idyllic.
I guess what they leave out of the story is how she came to have that kind of personal strength. It certainly helps to have all these people around you who are completely devoted to you and believe in you.
My whole view on the part about letting negative thoughts get in your way is that it's important to realise that that's a completely natural thing humans do. It's a survival mechanism. We're built to place a much larger weight on our failures than our successes for pretty basic genetic reasons. It's also important to realise that that's almost entirely useless in the modern world where we're very rarely in real danger from our failures. Negative, cynical and pessimistic thinking has almost no benefit in the modern world. Whereas positivity, belief and confidence really do make things happen.
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