"

Thinking is the hardest work there is, which is probably the reason so few engage in it.

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Whether you think you can or think you can't, you're right.

"

Whether you think you can, or you think you can't--you're right.

"

Thinking is the hardest work there is, which is probably the reason why so few engage in it.

"

You can't build a reputation on what you are going to do.