首楞嚴義疏注經 4.192

4.192

「云何俱現？富樓那！如一水中現於日影，兩人同觀水中之日，東西各行，則各有日隨二人去。一東一西，先無準的。」

"How do they appear together? Pūrṇa! It is like the reflection of the sun appearing in a body of water: when two people look together at the sun in the water, and walk east and west respectively, there is a sun following each of the two people. One goes east and one goes west, without any prior fixed standard."