“now he sensed that she was saying goodbye to him”

“Of course I told him about you," Liesel said. She was saying goodbye and she didn't even know it”

“Heil Hitler," he said, which, he presumed, was another way of saying, "Well, goodbye for now, have a pleasant afternoon.”

“She was saying goodbye and she didn't even know it.”

“Jenkins tried to say goodbye, but he could not say goodbye. If he could only weep, he thought, but robots could not weep.”

“When friends speak overmuch of times gone by, often it's because they sense their present time is turning them from friends to strangers. Long before the moment came to say goodbye, I think, we said goodbye in other words and ways and silences. Then when the moment came for it at last, we didn't say it as should be said by friends. So now at last, dear Mouse, with many, many years between: goodbye.”