Senses
鞭辟入里/ 鞭辟入裡 diligent in study
to push oneself in one's studies and delve deep into the subtleties of a subject
鞭辟入里/ 鞭闢入裡 variants: 鞭辟入裡 incisive
Describes writing or speech that is penetrating and cuts to the heart of the matter; trenchant; insightful