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He was summoned to the capital in 828 by Emperor Wenzong (r. 826-840) and awarded the purple robe and the honorific title "Great Worthy" (ta-te; bhadanta).
As of 827, Emperor Wenzong was waging a general campaign against the rebel general Li Tongjie, who had seized Henghai Circuit (橫海, headquartered in modern Cangzhou, Hebei) after the death of his father Li Quanlüe (李全略), who served as military governor.
Wei Chuhou (773-829), chancellor during Emperor Wenzong's reign
Emperor Wenzong summoned him and asked him for advice, and he responded, "The way of Emperor Yao and Emperor Shun (two mythical emperors known for their benevolent rule) were based on kindness and frugality. I wish that Your Imperial Majesty would keep that in mind." Emperor Wenzong appreciated the advice.
Zhou, in order to flatter Emperor Wenzong, responded that he could be compared to the mythical Emperor Yao and Emperor Shun.