So it is just my own experience, but it actually does affect the way you think somehow. I speak 4 languages (including 3 fluently that I use everyday) and I ve

So it is just my own experience, but it actually does affect the way you think somehow. I speak 4 languages (including 3 fluently that I use everyday) and I very often come across ideas or subtleties that just does not exist in one of those languages. When I started learning Japanese, I clearly remember understanding naturally some concepts in it that just cannot be expressed that precisely in English or French. One example that I come across often is the word "fluent" that just does not exists in French (there are equivalent translations, but no way to convey the very same idea). Once you speak if fluently, some words in Japanese have a very deep meaning that just cannot be translated while keeping the same exact meaning, like the words yabai or sugoi (to take very easy examples). You can even tell that Esperanto is very Western-centric just by looking at it structure anyway. It is written from the left to the right, has spaces between words, the same 3 different sets of characters (caps, non-caps and hand-written) with similar rules, same punctuation...