A great block of ice got settled in my belly and kept melting there slowly all day long, while I taught my classes algebra. It was a special kind of ice. It kept melting, sending trickles of ice water all up and down my veins, but it never got less. Sometimes it hardened and seemed to expand until I felt my guts were going to come spilling out or that I was going to choke or scream. This would always be at a moment when I was remembering some specific thing Sonny had once said or done. When he was about as old as the boys in my classes his face had been bright and open, there was a lot of copper in it; and he'd had wonderfully direct brown eyes, and great gentleness and privacy. I wondered what he looked like now.
The narrator doesn't know what Sonny looks like now, which suggests that they haven't been in contact for a long time. However, the news of Sonny's arrest still affects him deeply.