Something most non-polyglots fail to realize, is that the
language you use (even when thinking to yourself), does affect your
character and personality to a slight degree. Think about this :
mentally speak to yourself in English, then in your 2nd language,
do you notice a slight difference in your character or personality?
This is due to how the human brain works. This also explains why
polyglots have a richer, more diverse experience and thinking, as
each different language opens up a whole new world of a a different
culture.
Comparing Korean, Japanese and Chinese languages, and how each
affects your character and personality in a different way :
https://www.quora.com/Do-you-speak-Korean-Chinese-and-Japanese-What-does-it-feel-like-speaking-those-languages
