夏侯玄
One day, while seeking advice from Sima Yi, he sent a message to the latter: "The nine-rank system is not good. We should restrict the power of the controllers. Therefore, we should fundamentally change the rules and laws of provincial regions". Sima Yi replied that unless someone pushed forward those changes, they would not come into existence and hence the request could not be done. In response, Xiahou Xuan said that Sima Yi's opinion was too passive.