Hearing it, I understood that some part of her, shut away for six years behind everything my mother had done, had finally come back into the light.

I had built my entire life around the principle of never keeping anyone waiting.

I had made punctuality a religion, and I had believed, right up until Terminal 2, that being on time was the same thing as being a good man.

And the most important chapter of my whole life began, in the end, with a thirty-five-minute flight delay — with the one morning I could not control, could not manage, could not be early for.

I keep a single one of those returned letters on my office desk now, unopened, right where I can see it while I work.

It sits there as a reminder of a simple thing I paid too much to learn: that the walls people build between us can stand for years, and look permanent, and still come down in an afternoon — and that whatever it costs, and however late you arrive, breaking them down is worth every second it takes.

Mason keeps the returned letters now, in the blue suitcase, in his own closet; he decided they were his to keep, and he was right.

And every so often, on an ordinary evening, one of my sons will look up from whatever he is doing and say, for no reason at all, thirty-five minutes late, and grin, and I will grin back, because it has become the truest sentence in our house — the small joke that holds the whole enormous thing inside it.