What am I?
With thieves I consort,
With the Vilest, in short,
I'm quite at ease in depravity,
Yet all divines use me,
And savants can't lose me,
For I am the centre of gravity.
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I think the answer must be
The letter v
It's found in each of the words "thieves", "Vilest", "depravity", "divines", "savants" and "gravity" with the wordplay in each line subtly indicating that each word contains the letter.
'v' is the centre letter of the word gravity.