Literature Reference: 孜孜不倦，尧舜之德。——《尚书》 Diligently and tirelessly, with the virtues of Yao and Shun. Source from 'Shangshu'.
孜: Diligent and unwavering, never slackening in effort.
尧: Ancient emperor's name, symbolizing a person of both virtue and talent.
Meaning: Diligent and tireless, embodying the supreme virtues and wisdom of Yao and Shun.