私には無理です or 私は無理です


Why does the expression "impossible for me" in Japanese have 私には instead of
just 私は?




私は無理です may be colloquially passable, but is logically incorrect, because you
are saying “I am impossible” or “I am impossibility.” Clearly you are not
“impossible” entity. 私には無理です means （そのことを行うのは）私には(私にとっては) 無理（なこと）です‐“It’s
impossible (or difficult) for me (to do it), “ and sounds perfect to me.

Japanese language is pretty loose in distinguishing noun and adjective in use
as compared with other languages. We say 彼は正直(潔白)です. But you don’t say he is
honesty (innocence) in English. With that said, I think 私は無理です is still
awkward.

