Yes

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“It may help to understand human affairs to be clear that most of the great triumphs and tragedies of history are caused, not by people being fundamentally good or fundamentally bad, but by people being fundamentally people.”

- Terry Pratchett & Neil Gaiman, Good Omens

Possibly this?

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Not that one

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“It may help to understand human affairs to be clear that most of the great triumphs and tragedies of history are caused, not by people being fundamentally good or fundamentally bad, but by people being fundamentally people.”

- Terry Pratchett & Neil Gaiman, Good Omens

Is it this one:

This quest may be attempted by the weak with as much hope as the strong.

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

That's the one.

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“It may help to understand human affairs to be clear that most of the great triumphs and tragedies of history are caused, not by people being fundamentally good or fundamentally bad, but by people being fundamentally people.”

- Terry Pratchett & Neil Gaiman, Good Omens

akin to Frelga, I went a circuitous route through Hindi, Chinese (traditional), Serbian and Polish.

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

Is that Bilbo just before he left Bag End for good?

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No. But it is Bilbo.

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

That's funny, because this quote fits the translation almost perfectly:

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And did he ever repeat this sentiment?

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

Was it this one, in Rivendell after the Council of Elrond?

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No.... but you are getting close. One more place where he mentioned his book ending.

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

Okay, what about this, right after he made an attempt to get the ring back:

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No, now you have moved away from the very close quote you had the previous 2 times.

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

This one is closer:

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No.... it’s very very very very similar to your first two quotes. Almost identical, just spoken slightly differently & at a different time than the ones you mentioned.

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

Well, there's this quote before the party, which is word-for-word verbatim the same as the first quote I posted, which was spoken after the party just before he left for good:




Quite a lot, as it turns out

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Gawd, he did repeat it a lot, didn’t he!

So... it is in FOTR, and thus has to be between the party and the fellowship heading out...

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)

Well, if it's between the party and the fellowship heading out, the only thing I could find is the quote I posted first. If it's not that one, I'm at a loss.

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It’s right after the quote I just posted as an answer....

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*title copyright: Teremia

'You just said "your getting shorter": you've obviously been drinking too much ent-draught and not enough Prim's.' - Jude (as Merry)