‘Discipline’ sounds like making ourselves do something we’re not going to like. If we liked it, we wouldn’t need discipline. It’s a word that has some should in it. With related tones of harshness and negative consequences.
‘Precision’ achieves the same effect as discipline.
For example, if I’m trying to meditate for a total of an hour per day, precision gets me there just as well as discipline.
Precision can feel artistic or sophisticated. It requires attention. It can be the result of flow. Sometimes precision comes from stillness rather than impulse. Using just the right amount and kind of power, not just pushing harder.
Precision has many mental qualities in common with mindfulness. Precision can be kind without compromise.