I came across the idiom 「門を同じくして戸を異にす」 recently and was wondering what it
means. I tried looking it up online, but there are very few places where it is
explained.

Is there a cultural meaning behind this idiom? And if possible, is there
anywhere that I can find out more about it?
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question
meaning idioms
What is the cultural and grammatical meaning of 門を同じくして戸を異にす?
Meaning: Those of the same clan/house (門) go through different doors (戸). The
idea is that different members of the same family will not necessarily have
the same talents. This idiom is also similarly applied to situations like
students of the same teacher; members of the same organization; etc.

Origins: It's the Japanese reading
([書き下し文](https://en.wikipedia.org/wiki/Kanbun)) of the older Chinese 「同門而異戸」,
from [揚子](https://en.wikipedia.org/wiki/Yang_Xiong_\(author\))'s
[法言](https://en.wikipedia.org/wiki/Fayan_\(book\)), which was first published
in 9 CE.

The somewhat irregular grammar also stems from that era of forcibly rendering
Chinese text into a Japanese word order.
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answer