As for someone like Zhang Chao, who has not learned any Thought Sword techniques, the Court Master needs to first select a few suitable Thought Sword techniques he can learn, then also ensure that these Thought Sword techniques converge towards a certain Heart Sword path.
But there are only so many Heart Sword paths in the world, so which one would be willing to be learned by him?
And under what exacting conditions?
More importantly, the Sword Heart that is cultivated in the process must hold the potential to reach "Dao".
No wonder this task is up to the Court Master; it's probably only this Court Master, who's been in position for thirty years, that has nearly all the knowledge of the swords in the world and can sift through them to select a narrow but viable path.