研精致思

Explanation: Concentrate on research, best thought. 　　Source: "Later Han Zhai Medical Biography" His Majesty would like to personally labor-shirt, and research refined thinking, the minister Mian demand loyalty, far from eloquent flattery to punish the party, the loss of-sheng Yu-tang, respect Tianjue of weight, cutting the flesh of the joy, the private banquet strike good. "