In my opinion there's a fine line--a REALLY, REALLY fine line--between what you call "passionate phrasing" in your third-person narrative and an overblown, windy style that may detract from your story, or even be a detriment to it.
Objective observation does not have to be "cold and hard" to avoid the trap of being judgmental. Consider for a second that your own judgment as expressed by your third-person narration might even be a "spoiler" of sorts--if you make it really obvious to your reader how "you" (the omniscient narrator) feel about what's going on. An intriguing narrative does not label its characters "the good guy", "the bad guy", "the pretty girl of loose morals", "the heartless straw boss"--unless the intent is comedic. Otherwise, if you don't sort of step back and let your readers at least feel that they are formulating their own judgments about what you're showing them, you'll lose their attention.
NOTE: If the omniscient narrative is in a patois or dialect, or is more like an internal monologue or first-person account of something, then it's not really "third person omniscient", so let's discard that part of your question and just concentrate on the main part.
Here is an example of what I mean:
(The scene is that of a little girl selling matches on a street corner in the snow.)
First example 3rd person omniscient with personalization of narrative:
Now there's a poor kid standing there, she's so skinny you can just barely see her even from a few feet away, people passing back and forth, carrying their tinsel-decked holiday packages--they don't even look at her! No one seems to care, how awful.
Second example 3rd person omniscient with objective, descriptive narrative:
Between the hurrying shoppers and fat flakes of snow that tumbled from a stone-gray sky could be seen the slender form of a child, a girl, with a tray of holiday-themed matches slung from her thin shoulder. With seeming aimlessness the girl wandered up and down the sidewalk, peering with tremulous timidity up at the large, overcoated figures who passed. (etc)
I'm not saying that either of these is an example of great writing, just using them to demonstrate the difference between you (the writer) telling the reader how YOU feel about something, i.e., "Poverty and people's insensitivity to same outrages me"--and you (the writer) making THEM (the readers) feel a certain way, however you want them to feel, about your subject, by opening the curtain and showing them a scene.
If the reader thinks you are trying to tell him how to feel about something, he will likely reject you.
I'm not 100% sure that answers your question but I gave it my best shot. Good luck.
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