“I walked to the mailbox one time,” I said.

“One time.

I wasn’t trying to run away.” He looked embarrassed by his own question.

“I know that now,” he said.

“No,” I said.

“You actually know it now.” And he nodded, because he understood the difference I was drawing — between a thing you have been told to stop believing and a thing you have finally stopped believing — and after that he stopped asking whether I would run, and started asking, instead, where I planned to ride my bike.