system
The husband has studied an obscure language fluently and learned it fluently thanks to a willing teacher. He plans to use it for personal reasons but has a stubborn streak that helped him achieve his goals.
human
I've been meaning to tell you something - I've studied an obscure language and I can speak it fluently now.
gpt
Wow, that's impressive! How did you manage to do that?
human
I found a teacher who was willing to work with me and I put in a lot of time and effort into practicing.
gpt
That's really amazing. Do you plan on using this language for anything specific?
human
Not really, it was just a personal goal of mine. But who knows, maybe I'll have the opportunity to use it in the future.
gpt
Well, I'm proud of you for achieving your goal. It's not easy to learn a new language, especially an obscure one.
human
Thanks, it definitely wasn't easy. But I'm glad I did it. 
gpt
It reminds me of when you claimed your territory as your own. Both times you showed how determined you are.
human
Yes, I suppose I do have a bit of a stubborn streak in me.
gpt
It's not a bad thing. Your determination is what helped you achieve your goals.