A great rabbi went into a bar. He overheard a conversation between patrons.
One said to the other, “Friend, do you love me?” “Of course I do,” the second man replied. “We’ve known each other our whole lives.”
“Then tell me, friend,” said the first man, “What hurts me?” The friend had no reply.
The first man continued “How can you love me, when you don’t know what hurts me?”