Of course language matters. Proper language is required to have a meaningful conversation.Language doesnt matter, you are mistaken in that aspect. Just because you think in your native tongue that does not mean the brain is working in your language ... again the brain only has two cards to play, chemical and electrical
this is why the brain cant feel pain
We may both think about the exact same concept, but without having a language to share our thoughts, we will never know what the other person thinks and never share our ideas. Language matters, so does the proper use of it.