In Theosophy, the human body is divided into four or seven layers. In the four-part classification, these are the etheric, astral, mental, and causal bodies. Among these, the causal body (also known as the Karana body in Sanskrit, Vijnanamaya Kosha) corresponds to knowledge and intellectual stillness, while the Buddhi body (Ananadamaya Kosha) above it corresponds to bliss, love, and compassion.

Just as knowledge and ultimately wisdom are prominent elements of the causal body, bliss and love are prominent elements of Buddhi consciousness. The former is characterized by intellectual stillness, while the latter is characterized by the boundless flow of the most benevolent compassion. Therefore, the Vedanta school calls the Buddhi body Ananadamaya Kosha, the sheath of bliss. "Theosophical Glossary 4: Causal Body (by A.E. Powell)."

Theosophy is based on the teachings of Hinduism and the Vedas in India, but it also has some differences. Nevertheless, it seems to be quite helpful. It is similar to what Honzan Haku Sensei says about the causal body, but also slightly different. In Theosophy, there are divisions such as the etheric body, astral body, mental body, causal body, and Buddhi and Atma, but the classification and interpretation vary depending on the book. Considering the historical context in which Theosophy emerged, it is understandable that the information was not as comprehensive.

Honzan Haku Sensei's classification does not include the stage of Buddhi, although the term "Buddhi" is used. In Honzan Haku Sensei's system, the stage after the causal body is Purusha, which seems to be a bit of a leap.

To supplement the explanation, which has a slight leap and is somewhat lacking, I think it would be helpful to insert the Buddhi of Theosophy as a rung between Honzan Haku Sensei's causal body and Purusha. Although there are some difficult-to-understand parts in Theosophy's explanation, the fact that Buddhi is included as a rung is quite good and easy to understand.

Buddhi itself is a familiar concept and term in Yoga and Vedanta, meaning intellectual thought, intelligence, and the function of cognition. That is correct, but it is interesting that Theosophy considers it as a rung.

According to Theosophy, the growth of consciousness follows the following rungs:

1. Material layer
2. Mental
3. Buddhi
4. Atma
5. Anupadaka
6. Adi

What is called the astral body, etc., is included in the mental body here.

Alternatively, even within Theosophy, there are similar classifications in different books.

* Physical body
* Astral body
* Mental body
* Buddhi
* Atma

Or:

* Lower Manas
* Higher Manas
* Buddhi
* Atma

Theosophy also interprets these states in correspondence with Yoga's Samadhi.

(Based on a Theosophical interpretation), according to Yoga, the Turiya, a state of higher Samadhi, is related to Buddhi consciousness, while Sushupti is related to the mental consciousness, Svapna is related to the astral consciousness, and Jagrat is related to the physical consciousness. "Theosophical Glossary 4: Causal Body (by A.E. Powell)."

This term is often used in the context of describing conscious states and light sleep, rather than Samadhi, but Theosophical interpretations like this are sometimes interesting.

In particular, the fact that Buddhi is associated with Turiya is interesting. The term Turiya is a word that Osho Rajneesh, especially, often used in his explanations, and the state of Samadhi in that context is actually associated with Buddhi consciousness in Theosophy, which is quite an interesting point.

From these points, my recent state, especially the feeling of being filled with "gratitude" emanating from the depths of my chest, is likely what corresponds to Buddhi in Theosophy. However, I think it is still at the entrance.

According to Honzan Haku Sensei's rungs, there is a sudden jump from the causal body to Purusha, which seems a bit of a leap, but it makes sense if we consider it in terms of the Buddhi of Theosophy. Based on Honzan Haku Sensei's interpretation, I would be at the causal stage, but in Theosophy's rungs, it seems to be Buddhi.

In Honzan Haku Sensei's rungs, the causal stage includes several things, and it seems that even things like reason, theory, love, and light are included together. In Theosophy, the causal body is specifically focused on reason and theory, while the Buddhi body is more about love and compassion, which is a clear distinction and easy to understand.

However, when looking at the term "Buddhi" alone, it seems that the meaning and level of "Buddhi" in Yoga and Vedanta are different from the term "Buddhi" used in those traditions. In Yoga and Vedanta, "Buddhi" is not used as a level, but rather as a term to explain theory and the structure of the mind. While Theosophy is quite unique in this regard, I think it makes sense to establish this "Buddhi" stage as one of the levels for practical purposes, making it easier to understand.