醍醐灌顶（醍醐灌頂）　

◎ 醍醐灌顶 tíhú-guàndǐng

[pleasure of receiving wisdom like pouring rich liquor over one‘s head] 醍醐由牛乳精制而成,最益人体。故用以比喻灌给人智慧,使人头脑清醒。旧时也比喻听了精辟的言论深受启发

宝玉听了,如醍醐灌顶…——《红楼梦》