I'd be interested in some technical comments on the Pali:
Atthi kayoti va panassa sati paccupatthita hoti
There's a parallel with Dvedhavitakka sutta
which helps to understand this expression.
"Just as in the last month of the hot season, when all the crops have been gathered into the village, a cowherd would look after his cows: While resting under the shade of a tree or out in the open, he simply keeps himself mindful of 'those cows.' In the same way, I simply kept myself mindful of 'those mental qualities.'"
This indeed refers to a rather advanced stage of practice, when there's no immediate need to apply the right effort.
As for the kind of effort that may be required, - this is described in Bhikkhunupassaya sutta
"What four? Here, Ananda, a bhikkhu dwells contemplating the body in the body, ardent, clearly comprehending, mindful, having removed covetousness and displeasure in regard to the world. While he is contemplating the body in the body, there arises in him, based on the body, either a fever in the body or sluggishness of mind, or the mind is distracted outwardly.
That bhikkhu should then direct his mind towards some inspiring sign [nimitta]. When he directs his mind towards some inspiring sign, gladness is born. When he is gladdened, rapture is born.
When the mind is uplifted by rapture, the body becomes tranquil. One tranquil in body experiences happiness."