Every 90 days I lie in a whirling CT machine, dye coursing through my veins, and the doctors look to see whether the tumors in my liver are growing. If they are not, the doctors smile and schedule another scan. The rhythm has been the same since my doctors told me I had stage IV colon cancer two and a half years ago. I live for three months, take a deep breath and hope to start over again. I will probably do this for the rest of my life. Whatever that means.

I live by the day. Just sitting in the park, looking at the flowers thinking how beautiful they are. It's almost … not hallucinogenic but it's a much stronger feeling than previously. For me, at the moment, going for a walk in the park with Gail is heaven.

I feel a sudden clear focus and perspective. There is no time for anything inessential. I must focus on myself, my work and my friends. I shall no longer look at “NewsHour” every night. I shall no longer pay any attention to politics or arguments about global warming. This is not indifference but detachment — I still care deeply about the Middle East, about global warming, about growing inequality, but these are no longer my business; they belong to the future. I rejoice when I meet gifted young people — even the one who biopsied and diagnosed my metastases. I feel the future is in good hands.

what’s the difference? If I die in two years’ time, what will I do between now and then which I don’t want to do now? The main reason for living longer now is for the sake of my family and my wife. And this is not rationalist bravado entirely. I’ve had a wonderful life. Yes, I’ve done a lot of things I shouldn’t have done. But you know, I’ve had a full, complete life, and there’s nothing more I can do to complete it. Dying when you’re younger is obviously a totally different situation. Or losing a child. I mean, that’s beyond words.

Downstairs, the boys gaze at a screen on the old futon in the playroom. We will figure out what to do about them soon enough. They probably already know what’s up and are waiting for us to figure out how to say it. Their very existence is the one dark piece I cannot get right within all this. I can let go of a lot of things: plans, friends, career goals, places in the world I want to see, maybe even the love of my life. But I cannot figure out how to let go of mothering them.

None of this was supposed to happen. At 38, I wasn’t supposed to lie on my back in the E.R. on a late December morning and be told by a teary radiation oncology resident that the pain I’d been having for two months — that I’d been assured was from having a weak core after months of chemo — was actually from a tumor that had devoured my L2 vertebra. John wasn’t supposed to have to hold me up on the toilet. Put my pants on for me. Do Christmas Eve for the children without me. I’m not supposed to be thinking about where he will sit and hold my hand as I take my last breath.

So maybe I don’t try to figure it out. Maybe I just aim to get the couch right: strong bones, high-quality leather, something earthy and animal and real. A surface that knows something of what it was to be alive, that warms to our touch and cools in our absence. Also: an expansive bench that fits all of us. Something that will hold us through everything that lies ahead — the loving, collapsing and nuzzling. The dying, the grieving.