Star Trek: Deep Space Nine1993

[Curzon has decided to stay in Odo's body]

Commander Sisko:
Let me tell you something about Curzon. He was my friend, he was my confidant - in a way, he was my teacher as well. But he was also manipulative, selfish, and arrogant. Most people let him get away with it because he was so charming. Sometimes, I let him get away with it, too. But from time to time, he'd push me too far, and I'd have to stand up to him, tell him he'd crossed the line.

Lieutenant Jadzia Dax:
And how would he react?

Commander Sisko:
Sometimes he'd just laugh and admit it. Sometimes he'd be furious. But either way, he'd back off because he knew he was wrong. And he is wrong now.