People suffer pain differently.
A father falls unconscious while trying to save his family in a house fire. When he wakes up in the hospital, the doctors have to put him back into induced coma, simply because the pain of seeing his two little children burning is unbearable. You can understand this horror, you can explain it, put it into words.
But sometimes the pain is alien. We don’t know where it comes from. Sometimes we are hopeless to comprehend the logics behind the evils of our world. How easy it would be if we can just say: it hurts… and simply find some compassion. Instead we keep on silent. We smile.