Mason, another association strikes.
I'm recalling the poetry contest between Hui-neng (who became the 6th Ancestor of Chinese Ch'an), and the head monk of the monastery (whose name we don't as readily remember, funny).
The head monk was guided by a "wiping-and-cleaning" notion of practice, to characterize his zazen. It amounts to a trying to change something.
Hui-neng advocated a more contemplative practice, when evidently a level of quiet was already established: I think he expressed it as a "keeping watch over purity". I'd say it's observing what is within purity, or in other words, looking directly at emptiness.
(hmm, maybe it's looking at the mind or landscape after "Let go").
But Hui-neng and the head monk were writing about zazen, while I think your "practice-words" are exercised during the activities of everyday life. Is that right? Or maybe you're talking about applying the words (bringing them up) in zazen, or at least including zazen as well as bringing them up in everyday life, dunno.
Of course, Hui-neng and the head monk were full-time monastics and their practice was probably a more consistent and less knotty thread than others'. Perhaps then, due to the intensity of their practice, they had more of a chance to uncover "purity", and hence could have it as an actual meditation-object, and hence "keep watch over it". Still, Hui-neng seems to have spotted it and identified with it, while the head monk apparently missed it (or was not as natural a poet as Hui-neng was, to be able to express it as Hui-neng did).
But, there seems a real difference, and not only in expression.