This statement talks about obeying the person leading without questioning. This is necessary to mantain discipline and order
Explanation:
The story is set around the time when Viceroy of India is due to receive Amir of Afghanistan and his troops at Rawalpindi. One night, one of the camels stampeded and knocked over the narrator's tent. So, he takes shelte under a gun where several animals are tied and are talking about their fears and duties. During this talk, the mules talk about the need to obey their rider.
The next afternoon Afghans were impressed by the discipline shown at animal parade.
This statement is spoken by a mule when he says that they have to obey their rider.