Morally the wielder of power appears to cause the event; physically it is those who submit to the power.
If the source of power lies neither in the physical nor in the moral qualities of him who possesses it, it must evidently be looked for elsewhere—in the relation to the people of the man who wields the power.
There are no more uses of "wield" in the book.
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She wields little authority, but much influence in the company.