Majjhima Nikaya-1. Mūlapariyāyasutta (The Root of All Things)

Majjhima Nikaya:
Mūlapariyāyasutta (MN.1) - The Root of All Things.
The Buddha examines how the notion of a permanent self emerges from the process of perception. A wide range of phenomena are considered, embracing both naturalistic and cosmological dimensions. An unawakened person interprets experience in terms of a self, while those more advanced have the same experiences without attachment.