Literature Reference: You once urged and encouraged me, with harsh words piercing my heart. Source from 'To Di Shiyi, While Serving as an Officer in Weizhou'.
苦: The taste resembling bile or coptis, in contrast to "sweetness."
语: Exceptional linguistic eloquence, adept at showcasing one's strengths with finesse.
Meaning: Sincere and profound advice, though straightforward, is filled with care and motivation.