If you think you can,you can.If you think you can't,you are right!

If you think you can,you can.If you think you can't,you are right!
If you think you can,you can.If you think you can't,you are right!前面一句好像是“如果你觉得你能,你就能”,
后面一句到底是“如果你觉得不能，你也是对的”还是“如果你觉得不能，你就不能”？