Athanasius Kircher

Arithmologia, sive De Abditis Numerorum Mysteriis is a 1665 work by the Jesuit scholar Athanasius Kircher

This book is the only one of Kircher's works devoted entirely to different aspects of number symbolism, exploring numbers as the underlying principle and structure of the universe and as the key to mystic understanding previously revealed to patriarchs and philosophers in ancient times.

It combines religious mysticism with mathematics, and Kircher did not accept the mysticism uncritically, often discrediting common superstitions about numbers.