This expression is typical of the chinese thinking but has different interpretations :
The heart is separate from the belly
In the ABC dictionary :
人心隔肚皮 (rénxīn gé dùpí) People should always be on guard against one another.
In wiktionary :
- keep one's thoughts to oneself
- keep one's thoughts close to one's breast
- to not reveal what one is thinking
chengyu.org & zdic.net
谓人的心思难以猜测。 It's difficult to understand one's thought.
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