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Twelfth Night,
Act 1, Scene 3, line 69.

Note to Twelfth Night, 1.3.69, "thought is free"

Maria's "thought is free" means, no matter what you do I can still think what I think—Sir Andrew is trying to match wits with Maria, and he doesn't have a chance. He asked her if she thought that she "had fools in hand," meaning, "Do you think you're dealing with fools?" She replied "Sir, I have not you by th' hand," meaning that if she had him by the hand, she would be sure that she had a fool in hand. But he thinks—who can guess how a fool thinks?—that somehow he will prove that he is not a fool by giving her his hand. Her "thought is free" means, "no matter what you do I can still think what I think, which is that you are still a fool, no matter what you do."
Tonya Beckman as Maria with Craig Wallace as Sir Toby Belch