Literature Reference: 谆谆教导，言犹在耳。—— 《左传·襄公三十一年》 The earnest teachings still echo in my ears. Source from 'Zuo Zhuan, Year 31 of Duke Xiang'.
谆: Sincere and earnest.
Meaning: Sincere and earnest, often used to describe teachings or admonitions, symbolizing honesty and wisdom in guidance.