There is a well, and in it lies clear water. At the bottom of the well is a lot of sediment. When removing the sediment by means of a bucket on a long rope, it gets stirred up and muddies the water. Was it better to leave it there, building up gradually?
In meditation, the sediment is emptied out, and over time the water settles into its clear, pure state, with clean rock on the bottom. During the day’s worldly activity, new dirt is shoveled into the well, clouding the water and adding to the sediment at the bottom. Each day requires removing that sediment to open and clear the well so the water can run clear and pure again.