Yoga's prana can maintain health, or even just the energy of kundalini can be quite sufficient for daily life. However, there are also stages of energy beyond kundalini, which are generally referred to as "higher self" or "cosmic higher self kundalini." This is a more spiritual energy than kundalini, and of course, more spiritual than prana.

The terminology may be confusing, so I will describe it from the most physical to the most spiritual:

Body → Prana → (General) Kundalini → Higher Self (or Cosmic Higher Self Kundalini)

Initially, it starts with prana-related improvements such as diet and lifestyle, and eventually, one awakens to the energy of kundalini, and then to the awareness of the higher self.

By reviewing lifestyle and diet, one can enrich prana, purify through yoga and prayer, and eventually awaken to kundalini. After kundalini awakens, the body may feel hot for several months or half a year, allowing one to live healthily. However, as it settles down, the state becomes dominated by manipura, and from there, a gradual progression begins: the state dominated by manipura is followed by a state dominated by anahata, and then by a state dominated by ajna. These are all states of dominance of kundalini energy, and are different from the energy that occurs in later stages, such as the energy of the higher self.

As mentioned, kundalini energy, as described in theosophy, initially activates the lower body, then the upper body, and eventually reaches the ajna and sahasrara, but the state of "manipura dominance," "anahata dominance," and "ajna dominance" as kundalini energy, and the state of "anahata dominance" as the energy of the higher self, are quite different. The feeling is quite different, so it is clear that the energy itself is different.

Initially, kundalini rises, but this is simply a matter of kundalini energy. As kundalini rises, it activates manipura, activates anahata, activates ajna, and reaches sahasrara, allowing one to reach a state of stillness.

After that, by connecting with the Higher Self, the Anahata chakra is reactivated, focusing on the Anahata chakra again. However, this is different from the previous stage where the Anahata chakra was activated as Kundalini. This is because a higher level of consciousness, which may be called the Higher Self or Cosmic Higher Self Kundalini, is being activated. This can be said to be an activation in terms of chakras, but it is more accurately described as the Higher Self entering from the back, or connecting with the Higher Self that has entered from the back.

The Higher Self that entered was initially recognized as a consciousness of creation, destruction, and maintenance. However, the Kundalini energy that existed before remains unchanged, and it is recognized as a different energy that has entered or connected with it.

The consciousness of the Higher Self is expressed in various words. In yoga and Vedanta, it may be called Purusha or Atman. However, in yoga and Vedanta, these are often discussed as conceptual topics. At this stage, more practical teachings seem to be those of various spiritual traditions.

In systems such as yoga, the fusion with Purusha or Atman is often described as a temporary experience. This is done through so-called "secret techniques," and there are techniques that involve temporarily merging with Purusha or Atman during meditation and then separating. I have known about this for a long time, but I have never been taught how to do it. Perhaps only a limited number of people can do it, and only a limited number of people can teach it. However, it is possible to have a temporary union with Purusha or Atman, which can be considered synonymous with the Higher Self. In my case, however, the difference is that it is not a temporary union, but a constant connection.

I had already done something similar when I had an out-of-body experience as a child, and I remember it. I divided my own Higher Self's energy into three parts, and in the first stage, I merged one-third of it with my future self, which is my current self. When I was a child, I merged one-third of my Higher Self with my future self.

It seems that the intention was to achieve the effect of gradually establishing the aura of the higher self over time.

Next, the remaining two-thirds will be integrated. However, this kind of integration with the higher self can lead to irreversible situations if it fails. I believe this is based on my memories from when I had an out-of-body experience. For this reason, they are observing the situation and waiting for the right time.

Based on those memories, I think there might be another integration with the higher self in the future. However, I have forgotten the timing. As a spirit, the concept of a timeline is not very relevant, so it is difficult to know when it might happen. In any case, my future is determined by the judgment of my spirit from childhood. Literally, everything I do is my responsibility, and the results are up to me. I think that is acceptable.

Therefore, my experience is not so much about training, but rather about the fact that I planned an out-of-body experience myself when I was a child. Whether or not this will happen to others is unknown. I would like to add that.

In this kind of situation, there are often walls that are difficult to overcome. If you planned it beforehand, it might be easy, but if you didn't plan it from the beginning, it is almost impossible. Therefore, if you have learned various things in this lifetime, it might be a good idea to plan carefully in the next life. Alternatively, there is a method of having an out-of-body experience and resetting. However, I do not know if having an out-of-body experience will definitely lead to a reset. In any case, a state of consciousness that allows you to move freely with your astral body and transcend space and time is necessary. If you simply drift along with your astral body, you will likely have a life of drifting in the next life. Therefore, rather than worrying too much about life, it might be sufficient to do as much meditation or service as possible during your lifetime to improve your consciousness.