Literature Reference: Strive hard, my son, for I shall see you no more. Source from 'Zuo Zhuan: The 23rd Year of Duke Xi'.
子: Descendants, offspring. It also refers to the favored children of heaven, those who are learned and virtuous.
其: In essence, a person of integrity and trustworthiness. Describing someone who is sincere and dependable.
Meaning: It signifies encouragement and expectation for the child, hoping they strive hard and live up to the expectations.