Ancient ministers collected suggestions and allusions for the society.

Wei Zhi's suggestion is that whatever he thinks is right, he must say it to his face, stick to it and never talk behind his back. On one occasion, Emperor Taizong said to Sun Changmowgli, "Every time Wei Zhi makes a suggestion to me, as long as I don't accept his suggestion, he always refuses. I don't know why. Before Sun Chang Wuji could answer, Wei Zhi went on to say, "Your Majesty did something wrong, so I protested. If your majesty doesn't listen to my advice and I obey it at once, then I have to act according to your wishes. Isn't it against my original intention to make suggestions? " Taizong said, "You promised to take care of my dignity at that time, and then you remonstrated with me alone after you left the DPRK. Can't you? " Wei Zhi explained, "Once upon a time, Shun warned his ministers not to obey me in person, but told another story behind my back. This is not a manifestation of his deputies' loyalty to the monarch, but an act of betrayal. I beg your pardon. " Emperor Taizong greatly appreciated Wei Zhi's opinion.