最高不过离恨天最苦不过长牵念
[zuì gāo bù guò lí hèn tiān zuì kŭ bù guò zhăng qiān niàn]
'Heaven of Grievance can't be higher, and yearning painfully can't be longer.' It expresses the speaker's grievance and helplessness for losing someone they love. In ancient Chinese stories, '离恨天' (Li Hen Tian) was believed to be a place where parted souls reside, which is full of sadness. And '牵念' (qian nian), means missing or longing.