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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.
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