In The Empire Strikes Back, Vader says to Luke:

Vader: If you only knew the power of the dark side...

And he says it in a way that's obviously advertising its appeal to Luke.

If you only knew the power...

However, in Return of the Jedi, Vader says:

Vader: You don't know the power of the dark side... I must obey my master.

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Do Vader's feelings on the dark side change between ESB and ROTJ? If so, what brought about (or would bring about) such a stark and more or less sudden change?

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    Perhaps his view of the dark side hasn't changed - perhaps it's his feelings towards Luke that changed between the movies – HorusKol Dec 3 at 1:07
  • Well, he's not the only Dark Side-user around. Maybe the Emperor's Dark Side is stronger than his? – Cadence Dec 3 at 2:32
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    I don't get what's different. Both times he's telling Luke the Dark Side is more powerful than Luke knows. Slightly different words, same point. Okay, the second time Vader admits he has a master he must obey, but that doesn't change the sentiment about the Dark Side. – DavidW Dec 3 at 2:32
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    @DavidW It completely changes the sentiment. Vader impassionately saying "If you only knew the power..." with outstretched arm, beckoning Luke to come back off the ledge, was a dark side advertisement, something desirous that Luke or anyone would want. In ROTJ, the roles are swapped -- now it's Luke beckoning his father back from "the ledge", so to speak. This time, however, Vader's dispassionate, and follows his line with "...I must obey my master." He's essentially admitting he's a slave and has no choice in the matter. – Coldblackice Dec 3 at 3:06