Is this ~もので a grammar pattern?


I came across this JLPT N1 sentence:

> 人生はなにが幸いするかわからない **もので** 、たぶん、あれはあれでよかったんじゃないかと思う。

My literal translation:

> Life is a thing in which we don't know what will prove fortunate, but I
> think this is probably good in its own way.

What nuance, if any, does ~もので produce here?

It seems like もの is used strictly as a noun to mean "thing", but that seems
too simple for JLPT N1 (although maybe it's a red herring). I know there's a
breadth of 「もの」grammar patterns, especially ~ものだ, where this ~もので would be the
continuative form. For example the usage of ~ものだ implying "general tendencies
and cold facts". Coincidentally, a Japanese dictionary entry for 「幸いする」
includes an example sentence with near-exact phrasing
(<https://dictionary.goo.ne.jp/word/%E5%B9%B8%E3%81%84%E3%81%99%E3%82%8B/>),
leading me to believe that this may be a proverb.

(Sentence link: <https://japanesetest4you.com/japanese-language-proficiency-
test-jlpt-n1-grammar-exercise-9/>, #2)




This もので is the continuative form of ものだ, and this ものだ is used to introduce a
well-known fact or saying with a little bit of emotion. I think the [first
three usages explained in this
answer](https://japanese.stackexchange.com/q/43083/5010) are all somewhat
relevant. This type of ものだ is commonly used especially with advice based on
tradition, morals or experience. I don't think there is a perfect equivalent
in English, but maybe "indeed" is close to the nuance of this ものだ.

人生はなにが幸いするかわからない is not an idiomatic fixed proverb, but it's something we
often hear. (By the way, there is a
[proverb](https://jisho.org/word/%E4%BA%BA%E9%96%93%E4%B8%87%E4%BA%8B%E5%A1%9E%E7%BF%81%E3%81%8C%E9%A6%AC)
that exactly means this.)




This もので is the continuative form of ものだ, and this ものだ is used to introduce a
well-known fact or saying with a little bit of emotion. I think the [first
three usages explained in this
answer](https://japanese.stackexchange.com/q/43083/5010) are all somewhat
relevant. This type of ものだ is commonly used especially with advice based on
tradition, morals or experience. I don't think there is a perfect equivalent
in English, but maybe "indeed" is close to the nuance of this ものだ.

人生はなにが幸いするかわからない is not an idiomatic fixed proverb, but it's something we
often hear. (By the way, there is a
[proverb](https://jisho.org/word/%E4%BA%BA%E9%96%93%E4%B8%87%E4%BA%8B%E5%A1%9E%E7%BF%81%E3%81%8C%E9%A6%AC)
that exactly means this.)

