Rhapsodomancy

Rhapsodomantia sive divinatio ex rhapsodia aliqva poëtæ.

1953, Gaynor (ed.), Dict. Mysticism Rhapsodomancy: A form of divination, based on a line in a sacred book or book of poetry which strikes the eye when the book is opened, or which is the last line to be pierced by a needle stuck through the closed book.

Using chance to arrive at a particular passage in the I Ching is a form of rhapsodomancy: the seeking of guidance through the chance selection of a passage in a literary work. Another early form of rhapsodomancy is represented by the sibylline books. [...]