there is in us our own liquid (or “moisture”, οἰκείαν… ὑγρότητα) according to which we are sensible and by which we live; when this liquid is in its proper condition, the living creature is healthy, but when it is dried up, the living creature lacks sense and dies
Onians, citing Hippo, demonstrates that ancient physiology identified a specific internal liquid with consciousness and life itself, such that desiccation of that liquid constitutes both cognitive failure and death.
, The origins of European thought about the body, the mind,, 1988thesis