Literature Reference: 悦颜在目，心悦诚服。—— 《论语·学而》 His joyful countenance is before my eyes, and I am sincerely convinced. Source from 'The Analects of Confucius'.
悦: Joy and delight. Beneficial for physical and mental well-being, interpersonal relationships, and professional growth.
颜: Visage, countenance.
Meaning: A joyful countenance symbolizes inner happiness and peace.