What final comments do Nelly and Lockwood make regarding the dead? How do they seem to fit in with the final events of the novel

Nelly believes that in death.... the dead have found a peace they never had while alive.

'No, Mr. Lockwood,' said Nelly, shaking her head. 'I believe the dead are at peace: but it is not right to speak of them with levity."

From the text, we can infer that Lockwood doesn't share Nelly optimism.... he believes the trio still restless.

'THEY are afraid of nothing,' I grumbled, watching their approach through the window. 'Together, they would brave Satan and all his legions.'