Socrates based his theory on the immortality of the soul. He explained that a house ceases to exist when the bricks are taken away from each other. But the soul has no parts, and so we know of nothing which in the normal course of things would cause it to cease to exist, barring divine intervention. So it is reasonable to suppose that it is naturally immortal. (filthylucre.com). Socrates offers four arguments for the souls’ immortality.
The Cyclical Argument: According to the cyclical argument, all forms are eternal. They do not change and the soul always brings life and cannot be destroyed. The soul is the life-giving element, it cannot in itself be destroyed or cease to exist. The soul is necessarily imperishable. The theory suggests that the body and the soul are mere opposites. the human body being mortal would mean that the soul would have to immortal. This theory is explained with the example of fire and cold. It is stated that if the cold was imperishable when placed in proximity, the fire will have to withdraw intact as does the soul during death. This theory of the soul given by Socrates is similar to the theory of magnets, the poles and the attraction that exists between them.
The Theory of Recollection: According to this theory the human mind is born with certain empirical knowledge, some learning that has been achieved before encountering any experience and is said to have been brought from the previous form that the soul has taken, which would mean that the soul existed before birth. Socrates explains that the soul actually is aware of all knowledge because of which the soul actually has the knowledge of all things present and that it may not be entirely revealed to the human existence.
The Affinity Argument: Unlike the first two arguments, .the Affinity argument tells us something about the nature of the soul. (calpoly.edu). .