sentences:  Du Ruhui served on the staff of Emperor Gaozu's son Li Shimin the Prince of Qin, a major general.At that time, Li Shimin had many talented people on his staff, and soon, many were commissioned to be local officials.Du was scheduled to become the secretary general for Shan Prefecture (陝州, roughly modern Sanmenxia, Henan), when Li Shimin's trusted advisor Fang Xuanling pointed out that Du was highly talented and that Li Shimin could not afford to lose him.