One of the most difficult yet ironic spiritual challenges that we face is that our most important tasks are the most difficult to confront. The positive side of this story is that the extent of a challenge can sometimes be a clue to how to work more efficiently.
If we have a tendency to quickly turn away from work we know is important, for example procrastinating by indulging in sense pleasures or keeping busy with less important work, we do not need to be forever at the mercy of such habits.
Training in mindfulness means training in accepting what is in front of us. Instead of turning away from difficulty, we can learn how to embrace it. Very often, working diligently on those difficult tasks can be the key to setting us free from never ending busyness.
The most important of these difficult tasks is the task of spiritual reflection. The reason for that is simple. Only when we know and understand our priorities can we use our time in the most efficient way. The lightness of insight meditation as a method is specifically designed by the Buddha to lead those who practice it to a true understanding of the mental and physical world and our purpose within it.