Every frame of existence is joined together into the film of our life. This is the minimum definition of maturity - that we view life as a single connected thread and not be distracted into taking each moment as a discrete reality. We see everything in life as part of the whole, not as separate journeys. A child is impatient for this exact reason. Nothing seems to be going anywhere.
Every moment is katua, cut and separated from the next.
His attention span is measured in seconds. The definition of adulthood is the ability to weld all of these snapshots of reality into a single cinematic flow. Being an adult means that we perceive everything in life is a single system, a single route-map, a single film. Being an adult means having persistence of vision. The Torah is often compared to water.