人心对人心你真我就真
[rén xīn duì rén xīn nĭ zhēn wŏ jiù zhēn]
It simply means 'Heart against Heart: You're Honest then I'm Truthful'. This shows a wish for sincere interpersonal relationships built on honesty and truth from both sides. Only with such mutual genuineness would they consider themselves friends who truly understand each other.