Are you aware that by not citing the author of a quote, you are denying her the title of "Great mind discussing an idea" and instead claiming it for yourself?
I am however appalled at how many people chose to discuss attribution of the quote when the very quote itself instructs them not to. Reminds me of murderous zealots killing in the name of their merciful god; not in their savagery of course, but in the blinding irony of the situation.