爱到深处是无声爱到深处人孤独
[ài dào shēn chŭ shì wú shēng ài dào shēn chŭ rén gū dú]
"When love is deep, it is silent; when love goes deep, a person feels lonely." It suggests that the deepest love doesn't require much words to express and true affection often leads the individual into solitude as they immerse totally into their feelings.