Here is another piece of great wisdom from Luang Pu Doon, the late master of the forest tradition from Surin, Thailand:
No More Rebirth
Many senior practicing monks came to talk about the teachings with Luang Pu. They usually ended with the remark about some famous practicing monks who looked very worthy of respect and who behaved very well within the Vinaya rules, and who was recognized by their fellow monks of being steadfast in the religion, yet in the end could not make it and had to disrobe, or behaved themselves in such a way that blemished the Order. They would like to know how advanced in the practice they had to be in order to cut themselves off from samsara so that they did not have to be reborn.
Luang Pu said:
“Observing the Vinaya rules strictly and taking up the vows of a forest monk are very good practices. They are very worthy of respect. However, if the practitioner does not practice so that they attain great mind and great wisdom, it is always possible to become blemished. This is because they have not attained the state of going beyond the world. In fact the arahants themselves do not know many things at all. They only train the mind so that they fully understand the five skandhas. They fully understand the twelve links of dependent origination. They cease searching; they cease having fabricating mental activities. This is all there is to it. And it all ends here. What remains is only pure, clean, bright, empty. It is Great Emptiness.”