Saint Thomas Aquinas, also maintaining a dualistic view, described the two parts of a person as matter (the physical body) and form (the essence or soul). While bodies are universal, the individual's unique soul gives each person their distinct essence, differentiating them from other creatures and each other.

Saint Augustine, influenced by Plato, viewed man as bifurcated by nature, consisting of an imperfect earthly self and a part capable of immortality. His philosophy emphasizes striving for communion with God in a higher world, viewing the material world as temporary. Living a good life is essential to reunite with God after death.

The video introduces the concept of the self from various philosophical perspectives, encouraging viewers to consider what the self means, its components (mind, body, soul), and whether it is unique or connected to others. It poses questions about the existence of the soul, the reality of life, and the nature of consciousness, setting the stage for different philosophical viewpoints.

Socrates was among the first philosophers to focus on the self, proposing a dualistic view of a person composed of both body and soul. He believed in the importance of self-examination, famously stating, "An unexamined life is not worth living." Socrates also suggested that the soul exists before the body in a 'realm of ideas' and that questioning helps reconnect us to our innate wisdom.

Plato, a student of Socrates, further developed the dualistic concept, positing an ideal world (world of forms) separate from the material world. He described the soul as the divine aspect of the self with three components: the rational (reason), the spirited (neutral desires), and the appetitive (pursuit of desires). A healthy person balances these components.

René Descartes, considered the father of modern philosophy, introduced hyperbolical doubt, questioning the existence of the physical body as proof of existence. His famous quote, "I think, therefore I am," asserts that the mere act of doubting or thinking is undeniable proof of one's existence, shifting the focus from physical existence to cognitive capacity.

John Locke proposed that identity is based on psychological connections through memory. He argued that our continuous identity is formed by our ability to recall past experiences. Locke also introduced the concept of tabula rasa, or a "blank slate," suggesting that individuals are born without innate knowledge, and all understanding is gained through experience and sensory input.

David Hume, known for his bundle theory, believed that all knowledge comes from human senses (empiricism). He posited that the self is a "bundle of impressions"—vivid experiences, feelings, sensations, and perceptions. These impressions are then copied into "ideas," which are less vivid reflections of those experiences within the imagination.

Sigmund Freud, the father of psychoanalysis, theorized about the unconscious mind. He proposed two fundamental drives: Eros (pleasure, sex, life instinct) and Thanatos (pain, aggression, death instinct). He also introduced the three provinces of the mind: the Id (pleasure principle), the Ego (rational, reality principle), and the Superego (moral conscience). A healthy individual's ego balances the demands of the id and superego.

Freud outlined three levels of mental life: conscious (what we are aware of now), pre-conscious/subconscious (recallable memories and stored knowledge), and unconscious (unacceptable thoughts, fears, desires, and memories that heavily influence behavior but are not accessible to conscious awareness). The unconscious, though hidden, significantly motivates daily actions.

Gilbert Ryle denied the existence of an internal, non-physical self, asserting that the self is not a separate entity but rather a convenient name for the sum of an individual's observable behaviors. To understand oneself, one should examine their actions rather than seeking an unlocatable 'soul.' He uses the university metaphor to illustrate how we often look for the 'self' as a distinct entity, when it's expressed through our actions.

Maurice Merleau-Ponty rejected dualistic ideas, arguing that the mind and body are inherently inseparable and interlinked. He believed that what the body experiences directly influences the mind, and vice-versa, making any attempt to separate them futile. The self is an embodied subjectivity, where mind and body are intertwined in experiencing the world.