 One of the main sources on contemplation (guan) methods is the Neiguan jing (Book of Inner Contemplation; Kohn 2010: 179–87), another text spoken by Laozi in his deified aspect. This work emphasizes that the original state of clarity and purity is lost when the mind is overcome by passions and attachments caused by sensual cravings. When the mind is stabilized, disordered thoughts do not arise; one then does not only reach the state of quiescence, but the state in which both movement and quiescence are transcended.