This quote has always fascinated me. There are two opposing thoughts in just this one line. Darth Vader has been trying to convince Luke to join him in the Empire. He has tried to lure him with the power of the Dark Side. And yet in the same breath he admits that the Dark Side has not given him the power to rule, but the chains to be enslaved. There are plenty of religious allusions in there, if one cares to look and discuss.