Earlier quoted context omitted.
> of course I think about things using language. "of course", no most of my thoughts are not expressible in any language. Why would they? Thoughts are so much richer than any language can possibly express. How to solve this physics problem? If I had to do it via a monologue it would take forever. Same with programming. Instead I just think the thoughts directly and just solve the problem without verbalizing anything.…
> Thoughts are so much richer than any language can possibly express. I'm not sure about that. Couldn't it just be that we sometimes don't understand our own thoughts? If you can't describe one of your thoughts with language, I would say that you must not understand that thought. And of course we sometimes have thoughts which we don't understand. I think that understanding our own thoughts is something that needs to…
Another argument for OPs view (with the caveat above) is that these concepts must predate speech. We have an imagination before we have speech, and that obviously doesn't require words.