为誓言守护一世情为诺言倾尽一生爱
[wéi shì yán shŏu hù yī shì qíng wéi nuò yán qīng jĭn yī shēng ài]
Meaning 'Protect our lifelong relationship by this oath, devote a whole life's love to the promise'. It conveys devotion and a promise to remain true and loving throughout life, based on an oath.