Literature Reference: 有匪君子，自贤不已。—— 《上古之什补亡训传十三章》 A noble gentleman continuously cultivates his own virtues. Source from 'Shangguzhi Shi Buchuan Xun Chuan Shisan Zhang'.
自: Nature; the true self.
贤: Benevolent and prosperous. Often referring to individuals of noble character, virtuous and capable.
Meaning: Self-cultivation and continuous improvement of one's virtues and abilities.