良人不知深情深海不知终老
[liáng rén bù zhī shēn qíng shēn hăi bù zhī zhōng lăo]
'The Kind Person Doesn’t Know Depth, Deep Sea Doesn’t Know End' suggests feelings of immense affection or devotion so profound they are incomparable to ordinary emotions. The depths of love here liken to unfathomable depths of the ocean, implying infinite or enduring qualities.