Gentlemen were in line with natural laws possessing their unique opinions while villains gathered for benefits yet being derailed by natural laws. This was the difference between gentlemen and villains.
In case of being impeached, Zhang Tie still stuck to his post and performed his duties. As a result, he inflicted heavy losses on the Heavens Reaching Church. After that, he resigned. All this indicated that Zhang Tie was a gentleman.
By contrast, the Gobbling Party defended those who belonged to their own faction and attacked those who didn't by instigating an imperial official in Censorate to frame Zhang Tie with a rumor. As a result, they almost dismissed Zhang Tie's position before the Heavens Reaching Church rose in revolt in Youzhou Province. This indicated that the members of Gobbling Party were villains.
The law of officials was their professional conduct.