@knotty36
@sujato
We cannot let go of the background of Buddha Gotama who lived in India where the ascetic culture had been firmly established thousands of years before Buddha Gotama appeared. It is precisely impossible for a Buddha to appear in an area where there is no ascetic culture, because then no one would understand the wheel of dhamma that the Buddha taught. So ascetic culture is the ideal state from which a Buddha arises.
We also cannot separate Buddhist teachings in a sacred way that this is Buddhist teaching and this is not. This method of separation is a weakness of the method, not an advantage of the method.
What had grown up in the ascetic tradition in India before Buddha appeared was the ideal initial condition in that there were many human beings whose minds had been tempered with asceticism, whose knowledge already had the initial knowledge of karma, rebirth, realms of existence and even the idea of nibbana. (in their own concept).
The Buddha appeared bearing insight. Shows the path of liberation, realizes nibbana. The first thing to penetrate is the Four Noble Truths. As for the way concentration was developed, the Buddha used existing meditation techniques but with some modifications so that the correct view (sammaditthi) of body, mind, and external reality becomes as it is, leading to the path of liberation.
So the sort of what is immaterial jhana meditation, brahmavihara…etc. it’s buddhism or brahmanism, it’s a naive method. The Buddha used both material jhana and immaterial jhana as tools. How to enter jhana, what to pay attention to when entering jhana, it could be different with the origin technic in other ascetic sect. Because the jhanas that used to be just a place for sublime mental abidings were modified so that they became a tool for seeing “dukkha” in all the jhanas of mind.
Especially for non-material jhanas, in origin it is a place of residence of mind that is super peaceful and subtle, more peaceful than the mind of material jhanas. But the Buddha taught to see mental phenomena in the immaterial jhanas, seen as “dukkha”.
The immaterial jhanas are tools for directly seeing the workings of perception. So it is immediately apparent that whatever mental phenomena are conditioned, empty, constructed by perception. Even when the immaterial jhanas have been transcended, one can enter nirodhasamapati so that the subtlest sensations (vedana) and perceptions (sañña) cease to arise, and then one can immediately understand the conditionality of contact (phasa), vedana, sañña and their subsequent mental phenomena.
The Buddha used material jhanas and immaterial jhanas as paths of freedom, not perfunctory. Because in reality the realm of life is divided into three major realms: the sensory realm, the material jhana realm and the immaterial jhana realm. It is because of this attachment to birth/arising (bhavatanha) in one of these realms that beings are still manifesting, still being reborn. So attachment to the three worlds must be destroyed by direct experience. Therefore attachment to the material jhana realms and the immaterial jhana realms are two subtle fetters (uddhambhāgiyāni saṃyojanāni) which still shackles an anagami.