The paths of the Hundred Schools and the contentions of their doctrines are established by the worthy and passed down through virtue. But to reach the level of a Saint...
...is to be undying and immortal for myriad ages and myriad kalpas.
A worthy one's words carry reason. Even in a mortal body, they can contend with peak Earth Immortals.
The virtuous achieve the Unity of Virtue and Conduct. With every move, they are blessed by virtue and can fight and kill ordinary Grand Grade beings.
But to become a Saint is to have your Words Become Law. A single statement can become the law of the world, a single sentence can define the Third Celestial Realm. Even an immortal Celestial Venerable or Buddha would greet them with courtesy. And should a conflict with a Celestial Venerable arise, it is not impossible to fight and win.
'So this is what it means to be a Human Saint?'
