The Golden-winged Roc and Kong Xuan are actually brothers of a mother, and both are the children of Zu Feng. Moreover, the talent of the golden-winged roc bird is actually not worse than Kong Xuan.
Kong Xuan was born with such great divine powers as the five-color divine light, and the golden-winged roc bird was not bad. The golden-winged roc is born with the power of yin and yang.
However, do you know why the golden-winged roc bird could only become a demon on the way to the Tang monks and their gang to learn the scriptures later?
Because, the golden-winged roc bird saw that other great powers had magic weapons, and then he trained his most important thing, that is, the power of yin and yang, into a magic weapon yin and yang two gas cylinders.
If he hadn't refined the power of yin and yang into a magic weapon yin and yang two gas cylinders, the golden-winged roc bird could have cultivated the yin and yang path according to the yin and yang power in his body. It's much better than having a yin and yang cylinder!
Moreover, if the Yin and Yang Dao is cultivated to the extreme, the combat effectiveness of itself alone can be comparable to that of a great psychic of the level of the Buddha.
Who is Rulai? Western Buddha. That was one of the few Great Psychics in the Three Realms! (Note that the Three Realms are not floods)
In other words, the golden-winged roc could have stood at the same height as the Buddha. Hundreds of times stronger than those little monsters! But he gave up the Great Creation for the sake of the small profit of the fly!
Finally, to sum up, the golden-winged roc bird gave up the creation of the heavens for the sake of the small profit of the fly in front of it. So this incident tells us that as a human being, we can't just stare at the little interests in front of us, but we must look at the long term.