I have created a macro to quickly make quotations which should like this:

If I put the quote argument in quotation marks it looks like this (the quotation marks are shown):
{{quote "All models are wrong, but some are useful", George Box}}

But if I remove them, then it (of course) can't tell where the quote ends:
{{quote All models are wrong, but some are useful, George Box}}

It would be nice if the quotation marks could be removed. Is there a canonical way to do this?