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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 ...
Legally, you need permission to publish private communication. There is a lot on this on the web, you'll easily find it through Google. A response by a company to your inquiry is nevertheless addressed to you and private. You must at least anonymize it so that it is impossible to deduce which company you were writing to. If the letters have any kind of ...
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.
I would not consider adding any sentence requesting a response. Instead, saying "I would look forward to the opportunity to discuss your team" or something of that nature. That, as an example, highlights that you would look forward to further conversation initiated on their end.
In business communication, as in most other communication, you want to be as concise as possible while still being effective. Your sentence "The reason for which I am writing..." with or without the "to you" is unnecessarily convoluted. Try "I am writing to express my interest..." or even "I am interested in..." Get to the point. I read a lot of cover ...
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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