"Spiritual realization is to see clearly that what I perceive, experience, think, or feel is ultimately not who I am, that I cannot find myself in all those things that continuously pass away. The Buddha was probably the first human being to see this clearly, and so anata (no self) became one of the central points of his teaching."
January 1, 1970
https://en.wikiquote.org/wiki/Gautama_Buddha