So here is a sentence by Montaigne, I can get the overall meaning of it but I really can not figure out the meaning of "un pareil soin" here, and as for the "de" before "un pareil soin", I think it goes with "désespèrent"? Besides, what exactly does "il advient de" mean?
The sentence goes like this:
Il advient du mariage ce qui se voit aux cages: les oiseaux qui en sont hors désespèrent d'y entrer; et d'un pareil soin en sortir, ceux qui sont au-dedans. – Montaigne
En français contemporain. "Il en est du mariage comme des oiseaux en cage : ceux qui sont en dehors désespèrent d'y entrer ; ceux qui sont au-dedans veulent à tout prix en sortir."
For your first question, d'un pareil soin.
Soin has an old meaning, almost never used today, that means worry, anxiety. So, it means that the birds outside the cage suffer from the same pain as the birds inside, the firsts wanting to go in, the seconds to go out.
"D'un pareil soin" is a turn from the old French language and it would not be used nowadays. We could find in a contemporary translation something like this, in which the idea is not explicit as the expression has been simply omitted;
"D'un pareil soin" signifies "in reason of the the same state affairs", this implicitly stated state of affairs being the imprisonnement by means of a cage, which is also a means of isolation of the "prisoners" from the outside world. Interestingly enough, there is a chinese proverb that rhymes strangely with Montaigne's thought, and that I think worthwhile mentioning;
As per Littré, "advient" comes from the initial form of "advenir" (avenir) and this verb meant "échoir", "se faire"; "se faire" can be translated as "to come about".
