Philosophy of self

The philosophy of self defines the essential qualities that make one person distinct from all others. There have been numerous approaches to defining these qualities. The self is the idea of a unified being which is the source of consciousness. Moreover, this self is the agent responsible for the thoughts and actions of an individual to which they are ascribed. It is a substance, which therefore endures through time; thus, the thoughts and actions at different moments may pertain to the same self. As the notion of subject, the self had been harshly criticized by Nietzsche at the end of the 19th century, on behalf of what Gilles Deleuze would call a "becoming-other".

Philosophical definition
Most philosophical definitions of self--per Descartes, Locke, Hume, and William James are expressed in the first person. A third person definition does not refer to specific mental qualia but instead strives for objectivity and operationalism.

To another person, the self of one individual is exhibited in the conduct and discourse of that individual. Therefore, the intentions of another individual can only be inferred from something that emanates from that individual. The particular characteristics of the self determine its identity.

Self as an illusion
In spirituality, and especially nondual, mystical and eastern meditative traditions, the human being is often conceived as being in the illusion of individual existence, and separateness from other aspects of creation. This "sense of doership" or sense of individual existence is that part which believes it is the human being, and believes it must fight for itself in the world, is ultimately unaware and unconscious of its own true nature. The ego is often associated with mind and the sense of time, which compulsively thinks in order to be assured of its future existence, rather than simply knowing its own self and the present.

The spiritual goal of many traditions involves the dissolving of the ego, allowing self-knowledge of one's own true nature to become experienced and enacted in the world. This is variously known as enlightenment, nirvana, presence, and the "here and now".

Self-knowledge
Lao Tzu, in his Tao Te Ching, says "Knowing others is wisdom. Knowing the self is enlightenment. Mastering others requires force. Mastering the self requires strength." Adi Shankaracharya, in his commentary on Bhagavad Gita says "Self-knowledge alone eradicates misery". "Self-knowledge alone is the means to the highest bliss.". "Absolute perfection is the consummation of Self-knowledge."

Self as an activity
Aristotle, following Plato, defined the soul as the core essence of a being, but argued against its having a separate existence. For instance, if a knife had a soul, the act of cutting would be that soul, because 'cutting' is the essence of what it is to be a knife. Unlike Plato and the religious traditions, Aristotle did not consider the soul as some kind of separate, ghostly occupant of the body (just as we cannot separate the activity of cutting from the knife). As the soul, in Aristotle's view, is an activity of the body, it cannot be immortal (when a knife is destroyed, the cutting stops). More precisely, the soul is the "first activity" of a living body. This is a state, or a potential for actual, or 'second', activity. "The axe has an edge for cutting" was, for Aristotle, analogous to "humans have bodies for rational activity," and the potential for rational activity thus constituted the essence of a human soul. Aristotle used his concept of the soul in many of his works; the De Anima (On the Soul) provides a good place to start to gain more understanding of his views.

Aristotle also believed that there were four sections of the soul. The four sections are calculative part, the scientific part on the rational side used for making decisions and the desiderative part and the vegetative part on the irrational side responsible for identifying our needs.

Self independent of the senses
While he was imprisoned in a castle, Avicenna wrote his famous "Floating Man" thought experiment to demonstrate human self-awareness and the substantiality of the soul. His "Floating Man" thought experiment tells its readers to imagine themselves suspended in the air, isolated from all sensations, which includes no sensory contact with even their own bodies. He argues that, in this scenario, one would still have self-consciousness. He thus concludes that the idea of the self is not logically dependent on any physical thing, and that the soul should not be seen in relative terms, but as a primary given, a substance. This argument was later refined and simplified by René Descartes in epistemic terms when he stated: "I can abstract from the supposition of all external things, but not from the supposition of my own consciousness."

Bundle theory of self
David Hume pointed out that we tend to think that we are the same person we were five years ago. Though we have changed in many respects, the same person appears present as was present then. We might start thinking about which features can be changed without changing the underlying self. Hume, however, denies that there is a distinction between the various features of a person and the mysterious self that supposedly bears those features. When we start introspecting, "we are never intimately conscious of anything but a particular perception; man is a bundle or collection of different perceptions which succeed one another with an inconceivable rapidity and are in perpetual flux and movement".

"It is plain, that in the course of our thinking, and in the constant revolution of our ideas, our imagination runs easily from one idea to any other that resembles it, and that this quality alone is to the fancy a sufficient bond and association. It is likewise evident that as the senses, in changing their objects, are necessitated to change them regularly, and take them as they lie contiguous to each other, the imagination must by long custom acquire the same method of thinking, and run along the parts of space and time in conceiving its objects.'"

On Hume's view, these perceptions do not belong to anything. Rather, Hume compares the soul to a commonwealth, which retains its identity not by virtue of some enduring core substance, but by being composed of many different, related, and yet constantly changing elements. The question of personal identity then becomes a matter of characterizing the loose cohesion of one's personal experience. (Note that in the Appendix to the Treatise, Hume said mysteriously that he was dissatisfied with his account of the self, yet he never returned to the issue.) Hume’s position is very similar to Indian Buddhists’ conception of the self.

The paradox of the Ship of Theseus can be used as an analogy of the self as a bundle of parts in flux.

Self-enquiry and self-surrender
Ramana Maharshi's primary teachings documented in the book Nan Yar (Who am I) state:


 * Enquire into the source of the "I" Consciousness by asking "Who am I". The source or seat of "I" consciousness is the true self.
 * Self itself is the world; Self itself is 'I'; Self itself is God; all is the Supreme Self (siva swarupam)

Although his primary teaching was self-enquiry, he was also known to have advised the use of self-surrender (to one's Deity or Guru) as an alternative means, which would ultimately converge in to the path of Self-Enquiry.

Self as a narrative center of gravity
Daniel Dennett has a deflationary theory of the self. Selves are not physically detectable. Instead, they are a kind of convenient fiction, like a center of gravity, which are convenient as a way of solving physics problems, although they need not correspond to anything tangible &mdash; the center of gravity of a hoop is a point in thin air. People constantly tell themselves stories to make sense of their world, and they feature in the stories as a character, and that convenient but fictional character is the self.

The Buddha
The Buddha in particular attacked all attempts to conceive of a fixed self, while stating that holding the view "I have no self" is also mistaken. This is an example of the middle way charted by the Buddha.

Others
Other broader understandings of Self place it to mean the essence of any living being. With this understanding, Self is the hand of God or the expression of life that makes any living entity inherently unique.