Since no one else has posted today, and I have a lot to say about the comments on my last post, I'm adding a PS to it.
I agree with Alvina and Meghan that sometimes "I think I can" is a good thing to tell yourself.....
I loved Meghan's "of course" -- of course there are times when you can't do it -- but that isn't at all obvious to some of us: people like me who are over-optimistic and ever-hopeful, and kids, too. When adults in charge of children say believing you can do it and persistence are all that's needed and they AREN'T, the kids struggling feel even worse -- not only are they dumb but lazy (or whatever). Books with simplistic messages do make it easy for adults to apply the message even when it isn't helpful.
This may be way too much to be putting on one little book! What I probably should do is write a post on my personal blog about what's been going on in yoga class and the difference between letting go and giving up. But everyone's comments really made me think and I wanted to talk about it.