Literature Reference: 允执厥中，聿修厥德。—— 《尚书·大禹谟》 Hold fast to the mean, and cultivate your virtue. Source from 'Shangshu·Dayu Mo'.
允: Promise, to permit. It metaphorically signifies honesty and trustworthiness, ensuring that every commitment is fulfilled.
聿: The role of smooth succession.
Meaning: Fairness and integrity in holding to the mean, with diligence in cultivating virtue.