One who fails to observe mental and physical phenomena every time they arise cannot see them as merely mental and physical phenomena. Furthermore, on… - Mahasi Sayadaw

The Vammika Sutta likens skeptical doubt to a fork in the road. Say a traveler who is carrying many valuables arrives at a fork in the road; if he lingers there unable to decide which way to take, robbers may catch and possibly kill him. In the same way, a doubtful meditator who falls prey to wavering and procrastination cannot continue on with practice. He or she will then become a victim of mental defilements and be unable to escape the cycle of suffering. Only when he or she abandons doubt by noting it and uninterruptedly continues the practice can he or she be liberated from the cycle of suffering.

When intensively practicing insight, your first priority should be given to it, with the understanding that insight is the essential cause of liberation. ... You should not interrupt it for a minute or even a second.

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