"Whether You Think You Can or Can't, You're Right" - Henry Ford
Very Yoda-esque of ol' Hank Ford, eh? Of course, he's completely right. We succeed or fail not because of our ability or inability to do something but because of whether we think we can or can't.
Or, to quote Yoda, “Do or do not... there is no try.”
While leaving a comment over on one of John's Where's My Plan posts, I remembered something I learned a number of years ago while working out with some powerlifters. The body is capable of so much more than our minds think it is. It isn't whether or not I can benchpress 300 pounds but whether or not I think I can. And, after building up my strength to do it, I did. At a fairly mere weight of a few notches under 170 pounds I benched 305 three times. My body could do it, it was just my mind stopping my from doing it. Once I convinced myself I could do it, I did.
To a point, of course. I'm not saying you can make your mind up to throw a rock to the moon and do it.
But it isn't a stretch to say that you are far stronger, faster, smarter, more powerful and just plain better than you think you are. And the more you believe that, the truer it will be.