費心勞力 You Worry Far Too Much
八戒啐了一聲：「你這老兒卻也多心，三個妖魔也費心勞力的來報遭信？」公公道：「你不怕麼？」八戒啐了一声：「你这老儿却也多心，三个妖魔也费心劳力的来报遭信？」公公道：「你不怕么？」
逐句解 Line by line
Bajie spat. "You are a worrier, old man. Three demons, and you put yourself to all this trouble to come and bring bad news?"
啐了一聲 is to spit — a noise of contempt rather than actual spitting. 多心 is to have too much heart in the sense of too much suspicion, to fret; it is still the ordinary word for reading trouble into things. 費心勞力 is to spend your heart and wear out your strength, and Bajie is using it sarcastically about a man who walked out to warn strangers.
The old man said, "You are not afraid, then?"
Seven characters, and the question is not really a question. He has watched one of these creatures turn into a thunder god and is now being told three demons are hardly worth mentioning.
Bajie has spent the entire conversation being the reasonable one and abandons it in a single breath the moment he hears a number. Three is a number he can handle, so the warning becomes an imposition.
The sarcasm is aimed at exactly the wrong target. The old man did put himself to trouble; he stood on a slope shouting at strangers to save their lives, and has twice been knocked off his feet for it.
His reply is the best line he gets. Not an argument, not a defence of his warning — just a flat question about whether the pig has understood what he has been told.