闭门思愆

Explanation: Self-reflection that behind closed doors. With the "closed thinking too." 　　Source: "Three Kingdoms Shu Min Chuan Chi to" "take things left office," Pei Song of the note cited "Zhuge Liang _set_": "Since that can thin vulgar Li Tun, commander of the righteous. Jinji not, the table his resignation, the thinking behind closed doors trespass. " Thesaurus:  blocking remorse, blocking introspect one's fault