Originally posted by: THX
JediFlyer06's point is a good one. However, I think it's reasonable to explain Vader's words to Luke as a ploy - after all, we'd already seen him agreeing with the Emperor's hologram to recruit Luke.
Yeah, but whose idea was it to turn Luker? Vaders! The Emperor agrees with Vader, though mostly to placate him. The Emperor wanted him dead..."the son of Skywalker must not become a Jedi". Vader knows who Luke is and knows that his power, together with that of his son, can destroy the emperor and give him what he thinks he wants, power. He's a sith, that's all they care about. Ignore the friggin' prequels, the story of the OT was written long before, and has so little to do with the PT that it makes one sick. Vader wants power. Period. Luke is his secret weapon against the emperor, which is why he puts the idea of turning Luke on the table. They're Sith. They know the rule of two. From that moment on, each wants Luke for his own purposes. Vader wants him to help him destroy the Emperor. The Emperor wants him to destroy Vader and become a true, and complete (physically) Sith with power greater than even Vader.