梦到深处自然醒苦到心头自然甜
[mèng dào shēn chŭ zì rán xĭng kŭ dào xīn tóu zì rán tián]
A phrase expressing the complex human emotions of how deep dreaming leads naturally to waking, while extreme bitterness paradoxically becomes sweet, indicating a balance between hardships and joys within innermost feelings.