In act 4
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WEll, not really. He goes back to the witches where they riddle him some more and mess with his paranoid mind. I suppose he might feel confident after the sister's new riddles. No man can harm him, forests moving and all that. He says he has nothing to fear but this guy is paranoid all through this play. He goes to make "assurances double sure" and murders Macduff's family so I'd say no he isn't confident.