洞幽烛微

Explanation: Cave: insights; quiet: a far-reaching; candle: light; Micro: window dressing, fine place. Describe the sharp eyes, something deep insight into the fine detail. 　　Source: Ming Wu Cheng-en, "presented Bo Yu Shao County Gazette political order": "There is much of the next candle hole secluded, those containing Ru unhurried Zhang Xi of degree." 　　Examples: That can ~, focused on the vital, Feitu drilling and papers are comparable. (Qing Ma Jianzhong, "Rip-phase made traveling abroad working on a lesson")