To the extent to which a person is distanced from the settled world
Notes from Wikiquote
his heart being aware of the distance from all human nature | so he will receive stillness from thoughts. | For in the wilderness, my brother, we do not have much vexation from thoughts | nor do we weary ourselves over much struggle with them. | For the very sight of the wilderness naturally deadens the heart in the face of worldly stirrings | and restrains from the persistence of thoughts. | 3.4.51, p. 197