Liber Cordis Cincti Serpente, also called The Book of the Heart Girl with a Serpent, is a Class A sacred text of Thelema, a 20th-century occult tradition founded by Aleister Crowley. The number 65 is central to the work: it matches the Roman numerals LXV, the gematria value of the Hebrew word אדני (Adonai), and the number of verses in each chapter.
Liber Cordis Cincti Serpente
vel
LXV
sub figura
אדני
Originally by Aleister Crowley, 1907, now in the public domain.
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