海不曾怀疑人心比他深
[hăi bù céng huái yí rén xīn bĭ tā shēn]
'The Sea Never Doubts That Man's Heart Is Deeper Than Him' represents the belief in deep human emotions. It's expressing a sentiment that even if there are numerous mysteries about the depth of an ocean but compared to humans who are capable of very profound love, hate, jealousy or sorrow, the sea might look shallow by comparison.