Literature Reference: 长孝者，天之经也，地之义也。——《孝经》 Filial piety is the eternal law of heaven and the righteous principle of earth. Source from 'The Classic of Filial Piety'.
长: Strengths, merits.
孝: Filial piety and integrity refer to being a dutiful child and maintaining incorruptibility.
Meaning: Filial piety signifies enduring devotion and deep responsibility towards parents and elders.