Divine madness, also known as theia mania and crazy wisdom, refers to unconventional, outrageous, unexpected, or unpredictable behavior linked to religious or spiritual pursuits. Examples of divine madness can be found in Hellenism, Christianity, Hinduism, Buddhism, Sufism, and Shamanism.
It is usually explained as a manifestation of enlightened behavior by persons who have transcended societal norms, or as a means of spiritual practice or teaching among mendicants and teachers. These behaviors may seem to be symptoms of mental illness to mainstream society, but are a form of religious ecstasy, or deliberate "strategic, purposeful activity," "by highly self-aware individuals making strategic use of the theme of madness in the construction of their public personas".
According to June McDaniel and other scholars, divine madness is found in the history and practices of many cultures and may reflect religious ecstasy or expression of divine love. Plato in his Phaedrus and his ideas on theia mania, the Hasidic Jews, Eastern Orthodoxy, Western Christianity, Sufism along with Indian religions all bear witness to the phenomenon of divine madness. It is not the ordinary form of madness, but a behavior that is consistent with the premises of a spiritual path or a form of complete absorption in God.
DiValerio notes that comparable "mad saint" traditions exist in Buddhist, Hindu, Islamic and Christian cultures, but warns against "flights of fancy" that too easily draw comparisons between these various phenomena.
Georg Feuerstein lists Zen poet Hanshan (fl. 9th century) as having divine madness, explaining that when people would ask him about Zen, he would only laugh hysterically. The Zen master Ikkyu (15th century) used to run around his town with a human skeleton spreading the message of the impermanence of life and the grim certainty of death. According to Feuerstein, similar forms of abnormal social behavior and holy madness is found in the history of the Christian saint Isadora and the Sufi Islam storyteller Mulla Nasruddin.