After the filial piety gate was the fraternal duty gate.
Fraternal duty means brotherly love, helping one another, and in the broader term, it could also be extended to friends and mutual assistance.
With the experience of the filial piety gate, everyone has a considerable vigilance on the fraternal duty gate. Although it meant brotherly love, it basically did not have any relationship with the true brotherly love. On the trial like in the filial piety gate, although the implied rules did not violate the principle of filial piety, the people basically did not show any genuine filial piety—was presenting and receiving gift to and from cultivators that were virtually unrelated to each other could be considered as filial piety? How could there be such a ridiculous thing!
