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

A restless state of mind that wanders away from an object while observing it is a mental state called restlessness (uddhacca). It flies away from the object. Due to restlessness the mind cannot remain very long with an object but often wanders elsewhere.

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!"

Uncertainty about what is wholesome and unwholesome is called skeptical doubt (vicikiccha). It is considered a hindrance to liberation as it hinders the arising of discriminating knowledge. A person who has doubts about the wholesomeness and unwholesomeness of phenomena is unable to abandon what is unwholesome, develop what is wholesome, and escape the cycle of suffering.