I just got a system message saying it had removed the quote at the head of my reply. My reason for including it was for context as now there is no clue what specifically my reply relates to, it is just a general reply to the whole thread.
Replies are sorted in date/time order so my reply to a specific post will not necessarily appear straight after it. When replying to a specific point, the answer to a question perhaps, what is the correct way to provide context so that the reader does not have to skim back through the thread to guess what you are referring to?