From DilDev's Blog:
He dueled him for many a long minute, and then trapping him at the end of a gantry, removed his hand from his wrist. Luke was surprised, but said not a word beyond his cry of pain. After a silence of several minutes, Vader came towards him in an agitated manner, and thus began,
“In vain have I struggled. It will not do. My feelings will not be repressed. You must allow me to offer you a place at my side to throw down the Emperor and reign over this galaxy.”
Luke’s astonishment was beyond expression. He stared, coloured, doubted, and was silent. This Vader considered sufficient encouragement, and the avowal of all that he felt immediately followed. He spoke well, but there were feelings besides those of the heart to be detailed, and he was not more eloquent on the subject of tenderness than of ambition.
“You do not yet realize your importance, and only now have begun to discover your power. Join me and I will complete your training. With our combined strength, we can end this destructive conflict and bring order to the galaxy.”