Lillian Foster: I can't help thinking that if I'd stayed there, if I'd just gone and talked to Allan, he would still be alive.
Simon: Mmmm. Most likely you'd both be dead.
Lillian: Well, the way that I feel I might prefer that.
Simon: That feeling will pass.
Lillian: What do you know about that?
Simon: Enough.

Simon is, of course, alluding to his own feelings and experiences of "survivor guilt" over the death of his wife and child at the hands of Red John.