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Whether you believe you can do a thing or not, you are right.

You can do what you think you can do and you cannot do what you think you cannot.

Whether you think that you can, or that you can't, you are usually right.

But sometimes I think you have to try to do things that people don't think are doable.

It's not what other people believe you can do; it's what you believe you can do.

If you think you can, you can. And if you think you can't, you're right.

I think you can do anything you put your mind to. I think your mind is the worst thing you can use as a reason to not do something.

You must do the things you think you cannot do.

So if I think of something in my head I don't have to do it. If I can't do I don't do it, I do something else.