Now, it was Gravis' time to tell his story, and he started by telling everyone how he had started cultivating. He started this early because he had kept a lot of his life a secret from them.
Why?
Multiple reasons.
First of all, if his friends from the lower world heard that there were actually three levels of worlds above them, they might have become demotivated by the gigantic mountain they had to climb. Just hearing that Unity Realm Cultivators, legendary existences in the lower world, weren't even allowed to enter Gravis' home city, they would feel like trash.
Something similar was true for the beasts of the middle world. After all, if they heard that Immortals, people that could teleport, could only be beggars in the city, they might also get demotivated.
Another reason why Gravis kept a lot of his life secret was that he didn't want the beasts to feel horrible. After all, Orthar only cared about humans, not beasts.