许谁一世誓言不过一时嘴贱
[xŭ shéi yī shì shì yán bù guò yī shí zuĭ jiàn]
This phrase translates to 'A vow of a lifetime made is just a fleeting moment of rash words.' It reflects the sentiment that big promises or vows made lightly might not carry true meaning and can fade quickly.