"How many like Emperor Xuanzong are there in the Da Ye Dynasty? Most are merely mediocre, yet these people get to enjoy all the riches and luxury, oppress and exploit the common folk, revel in their power. Is that fair?"
...
In the quiet courtyard, with breezes wafting through, Pei Xuanjing's words clearly reached the other's ears, striking directly at the heart.
By the time Pei Xuanjing had reached his realm, though he had transformed into a True Immortal, his true nature hadn't changed; he treated everyone equally.
So for Emperor Xuanzong's complaint about the unfairness of heaven and earth, Pei Xuanjing utterly scoffed at it. The other's current wealth was built on unfairness, so what right did he have to talk about fairness?
Fairness is always relative, not absolute.