The purpose of argument is to change the nature of truth.
Empires do not suffer emptiness of purpose at the time of their creation. It is when they have become established that aims are lost and replaced by vague ritual.
That is one of the Law's purposes, of course: to test the qualities of those who choose to employ it.
For now is my grief heavier than the sands of the seas, she thought. This world has emptied me of all but the oldest purpose: tomorrow's life.