Ignorance immediately knows things in an ordinary, conceptual way. Because ignorance and its accompanying mental states arise first, wrong beliefs en… - Mahasi Sayadaw

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.

The insight process flows smoothly if sensual desires do not arise. If they do arise, however, they obstruct the flow of insight. They appear as rivals to insight, as if saying, "It is our turn; stay away insight!"

Every time one notes an object well it gives rise to delight. As a result of this, practice becomes enjoyable.