Quote source help!

[victoriavandal.livejournal.com]

Does anyone know an exact source for the quote 'you can't make an omelet without breaking eggs', which is often used with reference to (revolutionary) violence and variously attributed to Stalin, Lenin, Napoleon, and Robespierre (Google tells me vaguely, 1790,'on ne saurait faire une omelette sans casser des oeufs') - is there an exact source (speech, letter, pamphlet?). I appreciate it would probably be a popular saying prior to that anyway, but...

The other quote source I'm wondering about is Saint-Just's alleged response to Camille Desmoulins' written remarks about him carrying his head like the holy sacrament: "I'll make him carry his like Saint Denis" - was that a bit of contemporary gossip, or the invention of Buchner in his play 'Danton's Death'?