《贞观政要·卷三·论择官》
五是奉公守法，不收贿赂，谦让节制，这样的臣子，是贞臣。六是国家混乱，敢冒天下之大不韪，当面指出君主的过错，这样的臣子，是直臣。以上就是所说的 六正 。
五曰守文奉法，任官职事，不受赠遗，辞禄让赐，饮食节俭，如此者，贞臣也。六曰家国昏乱，所为不谀，敢犯主之严颜，面言主之过失，如此者，直臣也。是谓六正。
Fifth is being honest and law-abiding, not taking bribes, being humble and restrained. Such ministers are upright ones. Sixth is daring to take the great risk of pointing out the monarch's faults in person when the country is in chaos. Such ministers are outspoken ones. The above are the six types of "righteous" ministers.