Is the self an illusion as Buddhism proposes?
I'm not an expert on Buddhist philosophy or the history of Buddhist thought, Though I do know enough to know that it's complicated.
Perhaps we should start with that Buddhists call the Skandhas (or aggregates). These are
- form (or material image, impression) (rupa) Sensory experience, we might say.
- sensations (or feelings, received from form) (vedana) Emotions and sensations like pain might go here
- perceptions (samjna) Experience as interpreted - not just a colored shape over there, but a chair
- mental activity or formations or influences of a previous life (sanskara) We might want to put habits, tendencies and memories here
- discernment (vijnana) - Reason and the decision making faculty more generally
From looking at these, it's reasonably clear that they are phenomenological. They are an attempt at an exhaustive inventory of life as it is experienced.
en.wikipedia.org
There's the question what it is that Buddhists are denying. The Buddhist doctrine is called
anatman: (negation)-Atman. So what is Atman? Atman is a Hindu idea that basically means something like our word "soul", in the sense of a substantial essence of the person that can separate from the phenomenal self (body, memories, passions) and transmigrate to new lives.
In Hindu philosophy the Atman is thought of as the
unseen seer, the locus of pure subjectivity that experiences everything else. And some of the schools of Hindu Vedanta go so far as to argue that since there is nothing in pure subjectivity (considered apart from the content of what it happens to be experiencing) that identifies it as belonging to one person rather than another (all of us experience ourselves the same as "I" and "me"), all of our Atmans are numerically one. Just one single awareness experiencing life through an infinity of perspectives. (All the different humans, bird consciousness, bug consciousness, all sentient life) and the big realization is that the singular cosmic consciousness is really God's (Brahman's) consciousness and that all of us are really one with God (we actually
are God) if we just realize it.
en.wikipedia.org
The Buddhists didn't believe in Atman. They didn't believe that there was an inner experiencer, an inner eye that gazes upon (and feels and conceives) the Skandhas, the phenomenal content of experience. They opted for stand-alone phenomenal content without feeling the need for some mysterious transcendental experiencer that itself can never be an object of experience.
So for the Buddhists the Skandhas were all there is to a person. And the Skandhas are always changing as our sensory experience, feelings, cognitions, habits and decisions change. Hence, there isn't any fixed self let alone an eternal essence to any of us. Everything is changing, flowing, constantly in flux.
And while the Hindus devoted themselves to attempts to experience their inner oneness with God, the Buddhists elaborated theories that conceived of the person as a
process and elaborated the whole Abhidhamma philosophy as a (not all that successful) attempt to describe the inner process.
Of course just like the Hindus, the Buddhists elaborated these process theories for salvific purposes. The Buddhists hoped to understand the arising and subsiding of inner states (most notably suffering) so as to gain some control over it. Even when that isn't possible, they sought to reach a point where they could just watch the states come and go without attachment.
As for me, I tend to favor the Buddhist direction with regard to the self. I don't believe in the existence of souls and I'm attracted to a religious philosophy that I perceive as being somewhat consistent with modern neuroscience in conceiving of the self as a process rather than a transcendental substance.
But it's complicated. There have been all kinds of controversies within both Hinduism and Buddhism (and between them) about this stuff. So it's hard to talk about "the" Buddhist view. We need to talk about which Buddhist school's view, at what period. As enunciated by which authors. For example
iep.utm.edu