Yes, Terence McKenna has been to Texas. He mentions having traveled there on a few occasions, including a visit in 1972 when he entered Texas from Mexico on a phony passport, which is a memorable event for him as it involved facing a federal hashish importation charge in Boulder 35. Additionally, he has spoken about his experiences and impressions of Texas in various talks, noting the unique and intelligent aspects of the region 13.
What is Casting Nets in the Sea of Mind?
"Casting Nets into the Sea of Mind" is a book that Terence McKenna was working on, although it hadn't been published at the time of the reference. The title suggests a metaphor for exploring the depths of the mind and consciousness, much like casting nets into a vast sea to catch ideas and insights. McKenna often used the imagery of a fisherman casting nets to describe the psychedelic experience and the search for understanding within the chaos of the mind 1.
What about the Mandaeans?
The Mandaeans are a religious group that Terence McKenna describes as having interesting folk tales and religious beliefs. They are associated with a unique cultural practice involving a cult hut called a "mandae," where they divert a little ditch through it for ritual baptisms. McKenna notes that the Mandaeans' religious beliefs are quite fascinating, although he does not elaborate extensively on them in the available sources 5.