Literature Reference: Hold firmly to the center, and be a modest gentleman. Source from 'The Doctrine of the Mean'.
允: Promise, to permit. It metaphorically signifies honesty and trustworthiness, ensuring that every commitment is fulfilled.
谦: Humble, modest, and gracious. Polite, with a deep understanding of etiquette.
Meaning: Honest and modest, embodying the virtues of a noble gentleman.