“Whether you think you can do something or not, you're right”
“Whether you think you can, or you think you can't—you're right.”
“Whether you think you're right or you think you're wrong. You're right.""If you think in pictures, write. If you think in words, paint.”
“How do you know you're whether or not you can do something, unless you try?”
“If you think you can, you can. If you think you can't, you're right.”
“If you think you can you can, if you think you can't you're right!”