It is astonishing what you see, once you start looking there.

And it is the reason that, years later, I would put on a stranger’s uniform and walk into my own home through the service door.

I did not always know this about myself, this watchfulness.

It grew out of grief, the way a great many useful things do.

In the first year after my husband died, I was in no condition to run anything, and the people around me sorted themselves quickly into two groups: those who were kind to a woman who could suddenly do nothing for them, and those who had only ever been kind to a woman who could.

I remember, with a clarity that has never faded, a man who had spent years courting my husband’s business calling the house that winter, and hearing that I was not yet receiving anyone, and letting his voice change — just slightly, just enough — with the young assistant who answered, because she was no longer worth the performance.

I was on the other line.

I heard the whole small ugliness of it.

And something in me, half-dead with mourning, filed it away and understood: that is who he was the entire time.

I simply never had reason to see it before.