Momentary concentration that focuses on mental or physical objects from moment to moment is called nondistraction (avikkhepa), a mental state that is the opposite of restlessness. When momentary concentration becomes strong, the mind seems to penetrate its object every time an object is noted.
Mahasi SayadawRelated topics
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Let us pass to the despotic part of the soul, spirit. We must not eliminate it utterly from the youth nor yet allow him to use it all the time. Let us train boys from earliest childhood to be patient when they suffer wrongs themselves, but, if they see another being wronged, to sally forth courageously and aid the sufferer in fitting measure.
John Chrysostom
Sometimes the mind may wonder about practice itself. For example, the mind may wander off into analyzing whether an object was noted effectly, or sequentially, or vividly. The mind may wander off into thinking about how one is going to note an object. Under these circumstances, insight concentration cannot arise.
Mahasi Sayadaw