海怕人心比它深
[hăi pà rén xīn bĭ tā shēn]
'Sea Afraid the Human Heart Is Deeper Than Him', a poetic way to express that people may be more unpredictable and unfathomable than the ocean - implying deep-seated secrets, thoughts, and emotions. People's depth is compared with the sea, usually seen as boundless. So it's about exploring the profundity and complexity of human nature or feelings.