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A reading passage from practice JLPT test

>
> 人生というものには、いろいろな問題があります。しかし、それらのことも過ぎ去ってみると、あのときに迷わないでやってほんとうによかったな、というような場合が多いのです。そこが大事なところだと思います。ある場合には迷うこともあるでしょう。
> **しかし、しょせん迷ってもお互い自分の知恵裁量というものは、ほんとうは小さいものです。**
> だから、「これはもう仕方がない。ここまでできたのだからこれ以上進んで結果がうまくいかなくても、それは運命だ」と度胸を決めてしまう。そうした場合には、案外、困難だと思っていたことがスムーズにいって、むしろ非常によい結果を生む、ということにもなるのではないかと思うのです。

I have difficulty understanding the meaning of お互い自分の知恵裁量 in the bold
sentence. What お互い means? Does 知恵裁量 mean "discretion of knowledge"?
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meaning
What is お互い自分の知恵裁量?
I believe it means that we can only choose what is within our frame of mind.
There may be other, better ideas out there to be had but left to your own
devices, you choose what you think is best. I found literally the same passage
[here](https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q14131420194?__ysp=55%2Bl5oG16KOB6YeP)
of someone also asking what that means. The answer given in Japanese was

`知恵と裁量を同時に表した言葉なのでしょう。
人間の能力は限界があって見える範囲が限られている。本人は自分で決めたと言ってもその判断は所詮小さな枠内でのこと。本当は自分では感づいていないもっと違った選択肢があったはずで、それをやっていたら物事は大きく違っていたはずだ。という意味。`

Kind of steep even for the JLPT, no? lol

So `お互い自分の知恵裁量` would mean that both people or parties experience this same
limit of choices based on their respective knowledge.
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I believe the author should have written something like this:

> しかし、しょせんいくら迷ったところで、自分の知恵や裁量というものは、ほんとうは小さいものです。
>
> However, no matter how deeply you try to think, your own wisdom and
> discretion is actually small.

  * お互い makes no sense in this context. There is only one person in the first place.
  * There is no such compound or set phrase as 知恵裁量. I think this is just a list of two words which have been somehow joined without any particle.

In reality, you need to deal with half-broken sentences like this, but this
one is unsuitable for a test. If you were confused, it only means your
Japanese is good enough, so you don't have to worry too much about this.
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Let me put down my own shot at a translation up front. Some expository notes
follow.

> "There are times, sure, when we think long and hard. **But the things is, as
> long and hard as we may think, the control our minds -- yours as well as
> mine -- have, it actually amounts to only a small fraction.** " (Then he
> goes on to talk about how he thinks embracing a fatalist mindset instead and
> throwing little human worries out the window can actually lead to desirable
> results.)

For "お互い", check 精選版日本語大辞典's entry on
[weblio辞書](https://www.weblio.jp/content/%E3%81%8A%E4%BA%92%E3%81%84#:%7E:text=%E3%81%8A%E2%80%90%E3%81%9F%E3%81%8C%E3%81%84%20%E2%80%A5%E3%81%9F%E3%81%8C,%E7%9A%84%E3%81%AB%E3%82%82%E7%94%A8%E3%81%84%E3%82%8B%E3%80%82)
(relevant part bolded):

> 〔名〕 （「お」は接頭語。「たがい（互）」を丁寧にいう語） **同じ関係、状態にある自分と相手両方** 。また、両方が同じような事をし合うさま。
> **「に」を伴って副詞的にも用いる** 。

As this definition states, "お互い" can be used in reference to two people (the
speaker and another person engaged in some way by them) who find themselves in
the same situation (do the same thing, have the same quality, etc.) as each
other, plus it can be used adverbially by taking on a "に".

(What it doesn't tell you, however, is that the word can be used adverbially
without "に" and that the "two people" it refers to don't have to be the
speaker themselves (自分) and the their 相手.)

A couple of examples by way of illustration:

> お互い大変な一日だったね。 'We both(/each) had a rough day, huh?'

> 仕事の後はお互いそのまま家に帰りました。'After work, both(/each) of us went straight back home
> (i.e. went back to respective places of residence).'

In the case at hand, the two people in question are the writer/speaker and the
addressee.

As for "知恵裁量" it's not a common idiom, but rather an ad-hoc combination made
up of two words, 知恵('wisdom', 'intellect') and 裁量('latitude (= freedom as to,
or control over, decision and action)'. The internal relation between the two
components is a bit ambiguous, but I wonder if interpreting it as
"知恵(が持つ/の)裁量" (as I did in the translation) isn't too far off the mark.

By the way, as I found out through a quick web search, these are words of the
late
[松下幸之助](https://ja.wikipedia.org/wiki/%E6%9D%BE%E4%B8%8B%E5%B9%B8%E4%B9%8B%E5%8A%A9)
himself, the founder of Panasonic, juku for the elite and publishing house as
well as being a business guru and author with many best-selling books to his
name.
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