We learn nothing about why his mother or father might trouble him after their deaths but disapproving or disappointed parents are plentiful enough throughout Beckett's work. Joe suffers his father's ‘ghost’ for years until he realises that he can affect it, that by an act of will he can stop the words, to make the literally dead also figuratively dead. In a letter sent to MacGreevy on 6 April 1965, Beckett writes: "I shake at the thought of the ordeal you have been through. At least you are through it. You mustn't give up. Putting down memories is enough to make anyone crack." This is what Beckett means by the expression “All your dead dead,” those ‘ghosts’ that he has exorcised in this way. This is reminiscent of the following lines from "The Expelled":