Oh! Innocent cherubs!
Could someone give references or details on this quote?
See the left part of page #3:
The only explanation I could find is here.
Galois wrote this "Oh ! Chérubins" on the back of the cover sheet after the memoir had been (again) rejected. Presumably this is addressed to Mr. Lacroix and Mr. Poisson, whom Galois considers to be responsible for the rejection.
"Oh ! Chérubins" may be considered as a both condescending and sarcastic cry.
However, even for a French speaker, this is hard to interpret, since this expression is not common at all. In French, the word "Chérubin" is a kind of angel, or, in the colloquial language, an innocent child. Anyway, this word is not very common.