Maritime Provençal
Se toutei lei gau cantoun en meme tèms fara jamai jou.
Meaning
If all the cocks crow at the same time, it will never be daybreak.
Note : Applied to the members of an assembly who all wish to speak at the same time.
Theme
Source : La Tour-Keyrié, Recueil de proverbes provençaux (1882), Gallica — public domain. Maritime Mistralian normalisation by Lingua Nostra.