Marcus asked me to give a toast at his wedding. I said yes before I could think, and then I wept at my kitchen table for a quarter of an hour. When I finally flew to Denver in April, he met me at the airport, taller and broader than I remembered, in a good gray suit. He hugged me carefully, as if I might break, and said, “You told me I was tired. Nobody had ever said that.”

He told me that in eighth grade he was working nights at a laundromat to help his mother pay rent, which was why he slept through class. No one knew. My little note had been the first sign that a teacher had seen the real boy. He had kept it in his wallet for twenty-six years. It carried him through community college and an engineering degree, and now he designed bridges. I had never failed him, he said. I had noticed him.

At the rehearsal dinner, I stood and told the guests what I had learned that week. I said that in thirty-one years I had written thousands of red ink comments, and most of them were forgotten. I said I now understood that a teacher never knows which sentence will be carried in someone’s wallet. Several guests cried. Lena kissed my cheek and said Marcus had told her about me on their first date.

At the wedding, Marcus asked the officiant to pause, and he handed me a bound notebook. Inside, in his handwriting, were the names of forty students he now mentored at a night school for working teenagers, each one with a short note beside it. The cover said, “The Fielding Notes.” I still keep red pens in my purse, and I use them, but now I write only one kind of sentence.