After that meeting, we kept in touch by email, but never saw each other again. It was not just that I disappeared into my own world of deadlines and responsibilities but also my strong sense that the burden was on me to be respectful of his time. It was up to Paul if he wanted to see me. I felt that the last thing he needed was the obligation to service a new friendship.
— When Breath Becomes Air (Paul Kalanithi), Loc. 73–5