The only problem is that he didn't say it. And information on that has been provided before. You might want to take a look at Memoires Militaires by J Grabowski, which is available on Google Books.
You appear to rely too much on propaganda and exaggeration instead of actually researching the period and you have demonstrated that more than once, have you not?
Instead of relying on such historically flawed biographies by Barnett, Schom, and now Dwyer, you might look elsewhere at more credible sources.