Who said "I say what I mean and I mean what I say."?

This quote is attributed to Mad Hatter.

I say what I mean and I mean what I say. - Mad Hatter

"I say what I mean and I mean what I say."

Mad Hatter

Character in Alice's Adventures in Wonderland

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"Have some wine."

"We must have tea now."

"I've had nothing yet, so I can't take more."

"The best way to explain it is to do it."