Summary
Highlights
Many people today view the soul as a fictional or ethereal concept due to philosophical skepticism and neuroscience. However, the video argues that the human soul is a profoundly real entity. It aims to clarify common misunderstandings arising from materialistic and dualistic thinking by returning to St. Thomas Aquinas's insights.
Aquinas's central claim is that "the soul is the form of the body." This means the soul defines what a human person is, making them an embodied soul or ensouled body—a composite of body and soul. The soul shapes the person and coordinates matter to form a human. The soul is primary, giving unity to the whole, and actualizes the body.
Since the soul is the form, it is present entirely in the whole body and each part. It cannot be divided. Derived from the Latin 'anima,' the soul 'animates' the body, acting not as an external motor but as its very life force. The soul makes the body an actually living human person, performing acts proper to a human, and is the baseline of human actuality and the foundation for its powers.
Aristotle discovered the soul by observing that living things perform unique actions like sensing, desiring, moving, understanding, and willing. These actions lead back to faculties, and then to the soul as their seat. Therefore, if something performs actions characteristic of a living thing, it is ensouled.
St. Thomas Aquinas argued that a living thing can only have one soul. While animals and plants have vegetative and sensory souls respectively, man has only one rational soul. This rational soul virtually contains the powers of lower souls. A soul, as a form, is the source of substantial unity and coordinated activity, preventing the coexistence of multiple souls within a single living being.
Aquinas, citing St. Augustine, noted that intense activity of one soul operation impedes others (e.g., intense hunger hinders thought, deep thought makes one forget surroundings). This phenomenon suggests a single, unified soul, as independent souls would not exhibit such interference. The soul is not a 'ghost in a machine' or a mere emergent property, but a fundamental observation of what differentiates living from non-living.