'Our greatest blessings come to us by way of mania, provided it is given us by divine gift,' - says Socrates in Plato's Phaedrus. Certain forms of alteration of consciousness, considered to be inspired by supernatural forces, were actively sought in ancient Greece. Divine mania comprises a fascinating array of diverse experiences: numerous initiates underwent some kind of alteration of consciousness during mystery rites; sacred officials and inquirers attained revelations in major oracular centres; possession states were actively sought; finally, some thinkers, such as Pythagoras and Socrates, probably practiced manipulation of consciousness. These experiences, which could be voluntary or involuntary, intense or mild, were interpreted as an invasive divine power within one's mind, or illumination granted by a super-human being. Greece was unique in its attitude to alteration of consciousness. From the perspective of individual and public freedom, the prominent position of the divine mania in Greek society reflects its acceptance of the inborn human proclivity to experience alteration of consciousness, interpreted in positive terms as god-sent. These mental states were treated with cautious respect, and in contrast to the majority of complex societies, ancient and modern, were never suppressed or pushed to the cultural and social periphery.

'Our greatest blessings come to us by way of mania, provided it is given us by divine gift,' - says Socrates in Plato's Phaedrus. Certain forms of alteration of consciousness, considered to be inspired by supernatural forces, were actively sought in ancient Greece. Divine mania comprises a fascinating array of diverse experiences: numerous initiates underwent some kind of alteration of consciousness during mystery rites; sacred officials and inquirers attained revelations in major oracular centres; possession states were actively sought; finally, some thinkers, such as Pythagoras and Socrates, probably practiced manipulation of consciousness. These experiences, which could be voluntary or involuntary, intense or mild, were interpreted as an invasive divine power within one's mind, or illumination granted by a super-human being. Greece was unique in its attitude to alteration of consciousness. From the perspective of individual and public freedom, the prominent position of the divine mania in Greek society reflects its acceptance of the inborn human proclivity to experience alteration of consciousness, interpreted in positive terms as god-sent. These mental states were treated with cautious respect, and in contrast to the majority of complex societies, ancient and modern, were never suppressed or pushed to the cultural and social periphery.

Caves and the Ancient Greek Mind analyses techniques of searching for ultimate wisdom in ancient Greece. The Greeks perceived mental experiences of exceptional intensity as resulting from divine intervention. They believed that to share in the immortals' knowledge, one had to liberate the soul from the burden of the mortal body by attaining an altered state of consciousness, that is, by merging with a superhuman being or through possession by a deity. These states were often attained by inspired mediums, impresarios of the gods' - prophets, poets, and sages - who descended into caves or underground chambers. Yulia Ustinova juxtaposes ancient testimonies with the results of modern neuropsychological research. This novel approach enables an examination of religious phenomena not only from the outside, but also from the inside: it penetrates the consciousness of people who were engaged in the vision quest, and demonstrates that the darkness of the caves provided conditions vital for their activities.