Still not sure it's needed. I'll wave it through with [rare].

@@ -12,0 +13 @@
+<misc>&rare;</misc>

Fair enough.  It's alright with me if this is rejected for exactly the reasons you gave.

I wasn't going out of my way to add this entry, this was a side effect of editing 蒔かぬ種は生えぬ and wanting to excise "nothing comes from nothing" from there.  I started the entry before I learned it was from greek, and then just decided to finish it. 

In the rare/exceptional case that an English gloss happens to be coincidentally used on some entry, and it has a "recognized" translation into Japanese(as "nothing comes from nothing" was/does), then I think it might still be a good idea to also have an entry for the recognized Japanese form.

Not sure it's needed. It's an uncommon expression, clearly translated from Latin/Greek. Most of these sorts of entries are traditional Japanese ones; not translations.

@@ -11,3 +11,4 @@
-<pos>&n;</pos>
-<gloss>from nothing, nothing comes</gloss>
-<gloss>nothing comes from nothing (greek philosophical argument on the nature of existence)</gloss>
+<pos>&exp;</pos>
+<field>&phil;</field>
+<s_inf>from a Greek dictum</s_inf>
+<gloss>nothing comes from nothing</gloss>

N-grams
無からは何も生じない	20

https://en.wikipedia.org/wiki/Nothing_comes_from_nothing
Nothing comes from nothing (Greek: οὐδὲν ἐξ οὐδενός; Latin: ex nihilo nihil fit) is a philosophical dictum first argued by Parmenides. It is associated with ancient Greek cosmology, such as is presented not just in the works of Homer and Hesiod, but also in virtually every internal system: there is no break in-between a world that did not exist and one that did, since it could not be created ex nihilo in the first place.


「無からは何も生じない」（むからはなにもしょうじない、ラテン語: ex nihilo, nihil fit（エクス ニヒロー、ニヒル フィト）、英語: from nothing, nothing comes）https://ja.wikipedia.org/wiki/無からは何も生じない

This is an incredible article, where the guy actually spends several paragraphs on introducing the history of the philosophical argument before even attempting to apply it in an everyday context.

And his point is "My point is that food, and fashion, and business ideas come from everywhere – and often by joining – or colliding one form or tradition with another.".
It's nothing to do with diligence or hard work（蒔かぬ種）.  It's about acknowledging a creator (or acknowledging the history/roots of what we have).

Ex Nihilo – nothing comes from nothing
Everything comes from something
By Morf Morford mmorford@soundpublishing.com • August 1, 2022 1:30 am
https://www.tacomadailyindex.com/blog/ex-nihilo-nothing-comes-from-nothing/2458562/

=======================


Twitter results (mostly philosophy) nothing comes from nothing
https://twitter.com/search?q="nothing comes from nothing"&src=typed_query&f=top

Twitter results (mostly philosophy) from nothing, nothing comes
https://twitter.com/search?q="from nothing, nothing comes"&src=typed_query&f=top

Twitter results 無からは何も生じない
https://twitter.com/search?q="無からは何も生じない"&src=typed_query&f=top

Twitter post, Japanese woman planting flowers in a garden:
https://twitter.com/NMokuzan/status/1434637653752705024
Nothing comes of nothing.
（無から得られるものはなし）
無からは何も生じない蒔かぬ種は生ない大変でも一歩を踏み出すことが重要
【まずはやってみよう！って一歩踏み出して良かった😂】

Was adding this to try and clean up 蒔かぬ種は生えない a bit, where "nothing comes from nothing" was listed as a gloss.

無からは何も生じない seems like it's actually a really good example of 生じる... (which I've always found mysterious)

jisho.org already links this straight out of wikipedia.

But, the more I read about this, the more I think these phrases are not actually related.  This phrase is principally an argument about creation (ie. in the religious context) and the nature of existence. If you actually search twitter for the quoted strings "from nothing, nothing comes" or "nothing comes from nothing", the posts are actually relevant to religion, atheism, creation, etc.  They aren't random cliches.  

One non-religious use supports this: "Nothing comes from nothing, something comes from many smaller somethings.
It's true in physics, it's true in life."
https://twitter.com/joelwrightdev/status/1627835522889695235

This is not to say that no-one has used "nothing comes from nothing" in the sense of 蒔かぬ種は生えない。Example twitter video ("there are no shortcuts in life"):
https://twitter.com/DmuscleTV/status/1625890830455083011

But this seems to be the exception.

As such, I think any attempt to link this and 蒔かぬ種は生えない (which I think is mostly about diligence and hard work) would do more harm than good. 

I would like it to be clear, if possible, that the etymology of this phrase is not Japanese(which is why I included "greek philosophical argument"). This is be no means an every-day Japanese saying, but it's not hard to find if you look for it see: twitter.  Even found a pretty calligraphic rendition:
https://twitter.com/GSSsurounandane/status/853587638745485313

There is a latin gloss "ex nihilo, nihil fit"(wikipedia), but I don't see the point since this is a greek expression. I don't think this is a particularly well-known bit of latin in any case.