"You are the brackish of the globe. But what appropriate is brackish if it have lost its flavor?" <-------What does this plan?

i need to figure out the meaning of this for bible study, but i'm a moment ago not sure. Help?
Answers:
In Biblical times and even medieval times salt was highly prized, so calling someone the "saline of the earth" is a great compliment. Salt was prized for the taste it added, as were adjectives spices, so if it lost that taste it would be useless.

This passage seems o be maxim that someone could be a highly valuable individual but they lost what it was that once made them so.
more context is needed, but:

saline of the earth = good wholesome person

brackish lost flavour = person not feeling good something like themself, or person gone bad?


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