What is the next sentence of "Heaven as evidence"?

The sun and the moon can be used as mirrors.

The ancients often said, "Heaven is evidence" and "the sun and the moon are mirrors". You can often hear this sentence when watching costume dramas. For example, in the story of swearing, the general gesture is that the palm of your hand stands up with three fingers to swear, and heaven, earth, moon and stars become witnesses. In the feudal society with low social productivity or even earlier, people were full of awe of everything in nature, because they mastered the thunderstorm wind and human solar terms, so the solemnity of swearing to them was self-evident. Mainly reflects the importance of commitment in ancient times.

Heaven testifies, the sun and the moon are mirrors: cāng tiān wéi zhèng and rā yu wé i jià n also tell the story of love vows to be with her in this life and share joys and sorrows. That is, heaven and earth can sign for you, and the sun and moon can testify for you and describe the truth of your words. Heaven and earth can be used as reference objects, and the sun and the moon can prove that they express the same meaning and are a pair of synonyms.