“This very remarkable man
Commends a most practical plan:
You can do what you want
If you don't think you can't,
So don't think you can't – think you can.”
"On Monsieur Coué", Epigram in The Week-end Book (1928), p. 217.
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“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.”
Variant: If you think you can, you can. And if you think you can not, you are right.

Source: Song lyrics, The Sensual World (1989)

“Whether you think you can, or you think you can't — you're right.”