Literature Reference: No direct source in the 'Book of Songs', but 'Zi' and 'Yu' are common imagery widely used in classical literature.
子: Descendants, offspring. It also refers to the favored children of heaven, those who are learned and virtuous.
雨: The life-giving rain that nourishes all things.
Meaning: Zi symbolizes wisdom and scholarship, while Yu represents nourishment and vitality, together signifying intelligence and vitality.