... Darth Vader: - to Luke -... ".. you don't knoew the power .. of the dark side.. I must obey my master ".. ergo.. aka... I must.. follow orders... philosophically compelling scene from George Lucas.. screenplay.. Richard Marquant .. Marquand... was he.. the director..?.. "Return of the Jedi"...

https://www.youtube.com/watch?v=en8bh60K7m8