"The thing you wish," he says impatiently. "You've stopped me about my business;" and made vaguely ominous remarks, "presumably you want something."
Sorry, he was being not-helpful on purpose here. Since Gaav hadn't answered when asked what his business was. Or if you mean about the quote, it's this wonderful... well, it's Spock fielding a madman. I didn't find a clip, but here, it's about 20 minutes in. Even if it's a TOS episode, though, it might not be entirely worksafe in your job what with the dancing green slave girl...