惟将终夜长开眼报答平生未展眉
[wéi jiāng zhōng yè zhăng kāi yăn bào dá píng shēng wèi zhăn méi]
Originating from classical Chinese poetry, this line implies a commitment to remain awake all night in gratitude for an unfulfilled life (literally not able to relax or be happy). It conveys profound sorrow intertwined with a sense of duty or debt repayments through enduring hardship.