有一种信念叫永不言败有一种誓言叫海枯石烂
[yŏu yī zhŏng xìn niàn jiào yŏng bù yán bài yŏu yī zhŏng shì yán jiào hăi kū shí làn]
'There is a belief called never giving up, and there is a vow that lasts until seas dry up and stones crumble.' This conveys profound commitment, unwavering perseverance, and eternal loyalty despite any challenge.