Qui-Gon: "You bore all the responsibility for what happened. You went over and over your mistakes. You must know this, Obi-Wan—it is Anakin who chose to turn to the dark side. Grief did not push him there. You did not push him there. He made the choice."
Obi-Wan: "There were so many things I should have seen. So many places I should have corrected him."
Qui-Gon: "Yes. But you must accept your regret the way you accept your mistakes. Then move on."