English is my primary language and I learned Spanish in my 40s. But many things work much better in Spanish, so I do them in Spanish. In my experience , language absolutely influences your thoughts and your values.
I have an entire identity in Spanish that contains many relationships. If I think about or talk about those people in English, it is as if I am talking about someone I barely know. It is really odd, actually.
For example, not everybody has an inner voice – and this usually comes as a surprise to both people having or not having one.
Another good counterexample might actually be LLMs: Definitely well-spoken, definitely still not the greatest abstract higher-order thinkers, and domain-specific “intelligences” run circles around them.
I don't use an inner voice when I think about other things, how to do things, or figure out problems. Way too slow, and after all you can't use an inner voice to figure out how to get through a tricky four-car driving situation. You have to figure out what do do by entirely non-verbal means.
That’s why I can’t even -think- about math in Spanish, it just doesn’t work for me. I never learned mathematical concepts inside of that thought context.
And when I think of some people inside of English context, I can’t remember what it feels like to talk to them.
When I am tired I sometimes slip between contexts without knowing and cannot easily discern what language I am speaking or listening to.
I find it absolutely fascinating. It seems like there might be some insight to be had studying the phenomenon in people that experience it.