That which I say is mine, and I can say it, and I don't need to quote it, because it is mine you see. But that which others say, such as:
My theory by A. Elk, brackets, Miss, brackets. This theory goes as follows and begins now. All brontosauruses are thin at one end, much much thicker in the middle, and then thin again at the far end. That is my theory, it is mine, and it belongs to me, and I own it, and what it is, too.
should be set apart as a quotation.
Quotation by Anne Elk (John Cleese, Monty Python 1969)