satipatthana

Yogis should not be nothing and observing in a stop-and-go manner.The awareness should not be slack,sluggish,casual;not lagging behind or late;not gazing.It should be without wandering mind,with no room for thoughts.The nothing and observing should not be in a cool and hesitating manner;instead,it must be rushing in a systematic and orderly manner.Firmly grasping or seizing the object(upagganhitva pavattati)
A rice farmer when harvesting paddy needs to firmly grasp or seize a bushel of rice.Only then will he be able to cut it with a sickle.Similarly,a meditator has to firmly grasp the object of observation so that the mind will neither slip off nor lose the object under observation.
As mindfulness becomes steasfast,the yogis will be able to firmly seize coarse objects. With more practice,attention can hold on to more refined objects and eventually even very subtle objects can be firmly grasped by the mind. Therefore,a yogi should first try to grasp physical objects before attempting to seize the more subtle type of mental objects like intentions,etc.
Covering the object completely(Pattharitvapavattati)The nothing and observing mind must cover the object of observation completely,spreading over the entire object,enveloping it,grasping it,grasping it in its entirety.Not just a part of the object must be observed,but the object should be noted and observed from the beginning, through its middle,to its end.
Unbroken continuity(pavattati)
In the practical sense,this aspect means that the nothing and observing of the arising objects of observation should be continuous;that is,one moment of mindfulness connected to the next moment of mindfulness,moment after moment.The preceding moment of mindfulness should be connected with the succeeding moment of mindfulness.In brief,mindfulness should be sustained.