There Is Still Good in Him: Do The Jedi Believe Anakin Can Come Back From The Dark Side?

He wants Luke to kill his own father which Luke vehemently refused to do. That upset Obi-wan so he tells him that the "Emperor has already won" since Luke won't go after the Sith.

 

When Vader awakens on the table, he is distressed and dismayed to learn Padme is dead. He "felt her!" She couldn't be dead.

So too did Padme sense Anakin. She knew the 'thing' that nearly choked the life out of her still had good in him. She had felt it -- AFTER he had choked her.

Flash forward to Bespin in TESB . . . Luke confronts the painful, harsh reality that the Emperor's #1 hit man is his father -- a Jedi traitor and current Sith Lord.

After Leia "hears" and rescues the defeated Luke from the Antenna array, Luke and Vader sync up frequencies and tune in to each other. Luke wonders why Ben didn't tell him about Vaderkin. Vaderkin reaches out to his son. The son hears, senses the father, and the father pleads with the son.

In this moment, Luke and Vader conversant through the force, Luke feels something -- similar to what Padme felt. It changes him, alters his strategy and his destiny. Above all else, he knows without a doubt that he must personally confront his father. He, and he alone can save Anakin Skywalker from the bottomless darkness that mercilessly shackles his tortured soul.

Perhaps Ben knew. As a force ascended being one would think Obi-Wan intuitively knew. But he had to motivate Luke. One way to do so is challenge him, stoking his innate, perhaps even inherited rebelliousness.

What is clear is that Luke would never have succeeded without the training provided by Obi-Wan and Yoda, training we now know (from ROTS) was heaviliy influenced by the ethereal tutoring of Qui-Gon Jinn.