The meaning of discipline does not change. The active meaning is always following.
To follow objects is to be ruled by desire.
In the early stage of a discipline we follow technique. Here, desire is used to fuel or inspire our discipline. Thus, a mythical notion of a path leading to some good end. A useful dream.
Later, discipline only follows situation. The mind cannot be placed anywhere because it flows like water.
Kill the actor and the river runs free.