人心的世界太朦胧
[rén xīn de shì jiè tài méng lóng]
The world of human hearts is too hazy. Here, '人心 (rénxīn)' refers to human thoughts, feelings, desires, etc., while '朦胧 (ménglóng)' suggests confusion, ambiguity, vagueness, uncertainty, and mystery between people and in interpersonal relationships.