The untrained citta runs out and becomes fixated by its own constructions, the primary construction being the sense of self. Citta can be trained to contain itself in awareness of body, distancing it from the abstractions of the mind. This is a very peaceful place to be.
Realize that it’s possible to divert one’s normal preoccupations and thought patterns, and come instead into the sense of penetrating to the roots of it all. Collecting energy into this state of being conscious, being aware, lets citta flow freely, unconstricted by our habitual grasping of form.
Venerable Bhante Buddharakkhita's meditation instructions on the three characteristics of existence (impermanence, unsatisfactoriness, non-self)--given at the Uganda Buddhist Centre temple.