Freedom is described as the absence of greed, aversion and delusion. With wise concentration as a support, we can see into the ways our minds get caught by greed, aversion and delusion and that very seeing allows the mind to let them go.
We first look at the nature and limits of concentration, in part through the story of the Buddha. We then see how stillness developed in concentration, in relationship to the (relatively) still object, is brought to changing objects for the purpose of clear seeing of impermanence, suffering, and not self, leading to freedom.