Guo Jia was always accurate
in his judgments. In the beginning, Guo Jia joined and served Yuan Shao.
Later he joined Cao Cao through Xun Yu's introduction. He assisted Cao
Cao in the ruin of Lu Bu and the Yuan Shao family. Once Cao Cao said
of him, "Only Fengxiao knows what is in my mind." As an advisor
to Cao Cao he wielded great influence and Cao Cao had enormous faith
in him. For example, when Liu Bei came seeking refuge, he persuaded
Cao Cao to spare him or face rebellion by the people. He also convinced
Cao Cao that he had nothing to fear in Yuan Shao. He said, "Consider
these categories: duty, loyalty, politics, tolerance, strategy, moral
virtue, charity, judgement, law and war. For Yuan Shao these are ten
weak points that will lead to his defeat. You my Lord, excel in each
of these areas, these are your ten points for victory."