I am led to consider [. . .] what I might one day transmit to my son to ensure that he does not grow up like his father, which is to say, without warning. I still have no firm idea, not least because I have no firm idea whether my own descent into disorder was referable to an Achilles' heel or whether it's a generally punishable folly to approach life trustingly--carelessly, some might say. All I know is that unhappiness took me unawares.