Answer: There are 2 specific things one receives with Fire - Light and Heat.
Light is fairly obvious I think, to build a blaze to see by...
There is an idiom that says “to build a fire under someone (to get them to do something)”; they are lazy or an answer must be found quickly; a sense of urgency. In WWII, it meant to simply “Hurry!”, “Build a fire under that Pilot”, as in a rescue of men surrounded.
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