structural:reformatting, structural:expansion
Thoughts on the afterlife and resurrection

A grasp of Thomas's psychology is essential for understanding his beliefs about the afterlife and resurrection. Thomas, following church doctrine, accepts that the soul continues to exist after the death of the body. Because he accepts that the soul is the form of the body, then he also must believe that the human being, like all material things, is form-matter composite. The substantial form (the human soul) configures prime matter (the physical body) and is the form by which a material composite belongs to that species it does; in the case of human beings, that species is a rational animal. So, a human being is a matter-form composite that is organized to be a rational animal. Matter cannot exist without being configured by form, but form can exist without matter—which allows for the separation of soul from body. Thomas says that the soul shares in the material and spiritual worlds, and so has some features of matter and other, immaterial, features (such as access to universals). The human soul is different from other material and spiritual things; it is created by God, but also comes into existence only in the material body.

Human beings are material, but the human person can survive the death of the body through the continued existence of the soul, which persists. The human soul straddles the spiritual and material worlds, and is both a configured subsistent form as well as a configurer of matter into that of a living, bodily human. Because it is spiritual, the human soul does not depend on matter and may exist separately. Because the human being is a soul-matter composite, the body has a part in what it is to be human. Perfected human nature consists in the human dual nature, embodied and intellecting.

Resurrection appears to require dualism, which Thomas rejects. Yet Thomas believes the soul persists after the death and corruption of the body, and is capable of existence, separated from the body between the time of death and the resurrection of the flesh. Thomas believes in a different sort of dualism, one guided by Christian scripture. Thomas knows that human beings are essentially physical, but physicality has a spirit capable of returning to God after life. For Thomas, the rewards and punishment of the afterlife are not only spiritual. Because of this, resurrection is an important part of his philosophy on the soul. The human is fulfilled and complete in the body, so the hereafter must take place with souls enmattered in resurrected bodies. In addition to spiritual reward, humans can expect to enjoy material and physical blessings. Because Thomas's soul requires a body for its actions, during the afterlife, the soul will also be punished or rewarded in corporeal existence.

Thomas states clearly his stance on resurrection, and uses it to back up his philosophy of justice; that is, the promise of resurrection compensates Christians who suffered in this world through a heavenly union with the divine. He says, "If there is no resurrection of the dead, it follows that there is no good for human beings other than in this life." Resurrection provides the impetus for people on earth to give up pleasures in this life. Thomas believes the human who prepared for the afterlife both morally and intellectually will be rewarded more greatly; however, all reward is through the grace of God. Thomas insists beatitude will be conferred according to merit, and will render the person better able to conceive the divine.

Thomas accordingly believes punishment is directly related to earthly, living preparation and activity as well. Thomas's account of the soul focuses on epistemology and metaphysics, and because of this, he believes it gives a clear account of the immaterial nature of the soul. Thomas conservatively guards Christian doctrine and thus maintains physical and spiritual reward and punishment after death. By accepting the essentiality of both body and soul, he allows for a Heaven and Hell described in scripture and church dogma.