Pain is not incommunicable, that's just... man, whatever. The way in which it affects one's thought processes, emotions, attachments, and actions is only too visible, too harrowing to forget. We may not be able to look at the fire, but its path lies right before us.
"A poem as lovely as a tree: As the night wind blows, the boughs move to and fro. The rustling, the magic rustling that brings on the dark dream. The dream of suffering and pain. Pain for the victim, pain for the inflicter of pain. A circle of pain, a circle of suffering."