"There is no mausoleum in the mountains, heaven and earth are in harmony, dare to break with you!" what's the meaning

This is a poem by Shang Yang, and the most common one is the faint love oath in Princess Zhu Huan. Generally speaking, when the peaks are no longer angular and there is no boundary between heaven and earth, then I can be separated from you. In other words, I can't leave you, and we will do it till death do us part.