The vesica piscis has been the subject of mystical speculation at several periods of history, and is viewed as important in some forms of Kabbalah.

Tautologism, a tendency toward using sage remarks, making mystical and philosophical speculations, and disregard for order became the hallmark of his later writings.

The mix of Jewish theology and Greek philosophy led to a syncretic mix and much mystical speculation.

He also felt that mathematics and logic served as a remedy to metaphysical and mystical speculation.

The Bible provides ample additional material for mythic and mystical speculation.

He was an erudite champion of mystical religious speculation and a poetic diviner of syncretic cultural interaction among people of all faiths.

The first space experiences, poorly communicated and subject to extreme distortion, were a wild inducement to mystical speculation.

It represents the ultimate form of fusion between material ( science, reason, intellectual speculation ) and spiritual knowledge: the occult, mystical speculation and Kabbalism.

Pointless, mystical speculation.