Dịch - English-Latinh - May it not be immortal since it's flame ...

quia --> quoniam?

perdurare = to endure, to hold out

Are you sure it is better than simple "permanere" = to last, Alex? And I'd rather put this verb in the indicative form...

Ops! Aren't quia and quoniam always interchangeable (as I was told)?

"permanere"

But I think the meaning of "dum" changes depending on the mood, doesn't it?

There is actually a subtle difference in their meanings:
quia - because
quoniam - since, seeing that

After "dum" we can have different moods, Alex.
Do you remember the famous Epicurean motto?

"Dum vivimus (ind) vivamus (subj.)"= While we live, let us live.

Yes, of course.

But I remember something like this:
- "dum + indicativus" focuses on duration
-> dum permanet = it. mentre dura;
- "dum + coniunctivus" focuses on the end
-> dum permaneat = it. finché dura

Therefore I thought that the subjunctive mood would convey better to the meaning.

Isn't it?

I'm not sure, Alex. The example I gave you (dum vivimus) shows the same duration and the verb is put in the indicative. Unless I interpret this wrong?

Let's ask Efylove for her opinion.

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Hi Efee!
Could you tell us which mood you would use in this case?

CC: Efylove

Hi Aneta! Hi Alex!

I love that phrase that I sent. Thank you for trying to translate the best way.

Hi Aneta and Alex!
I agree with Aneta's use of indicative: "dum vivimus".

Alex, "dum + indicative" = "finché" when what you are saying is a statement of fact; "dum + subjunctive" = "finché" when what you are saying is a possibility.

Ok.

Thank you very much!

In translating Latin-Italian I never face this kind of problems, unfortunately.