Napoleon's saying

Actually, there seem to have been two quotes. The first one is attributed to Napoleon in 1803 (ie before he became emperor), he is said to have pointed to a map, on china and said (more or less, there are many versions of the quote)
"Ici repose un géant endormi, laissez le dormir, car quand il s'éveillera, il étonnera le monde" - "here lies a sleeping giant (lion in other versions), let him sleep, for when he wakes up, he will shock the world"

And then, there is a second, more famous one, which is supposed to have been said in St Helena (in which case, it might be in Las Cases Memorial of St Helena): "quand la chine s'éveillera, le monde tremblera" (when China wakes up, the world will shake).