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You could use empty brackets with a space between them. Brackets are generally used to alter a quote inline, such as fixing grammar or to add information like a name so the quoted material will work within the context of the piece quoting it. "desire[ ] all people to be saved" or don't quote that word: It is possible for God to want "all people to ...
I would go with the following. It is possible for God to "[desire] all people to be saved." To me, this suggests that the original quote clearly implied the word desire; a rephrasing like It is possible for God to desire "all people to be saved." leaves more ambiguity.
In this example, just move the word in question outside the quotation marks: It is possible for God to desire "all people to be saved." It's more difficult in the case that the word in question is buried in the quote. In that case, you would probably just put the entire word itself in brackets.
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