Center of Gravity Riddle

Puzzle of the Day 2141 : Center of Gravity Riddle
30 Seconds Puzzle : Presence of Mind

Riddle :

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 center of gravity.

What am I?

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