- The history of Christianity
The immortality of the soul
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Human beings seem always to have had some notion of a shadowy double that survives the death of the body. But the idea of the soul as a mental entity, with intellectual and moral qualities, interacting with a physical organism but capable of continuing after its dissolution, derives in Western thought from Plato and entered into Judaism during approximately the last century before the Common Era and thence into Christianity. In Jewish and Christian thinking it has existed in tension with the idea of the resurrection of the person conceived as an indissoluble psychophysical unity. Christian thought gradually settled into a pattern that required both of these apparently divergent ideas. At death the soul is separated from the body and exists in a conscious or unconscious disembodied state. But on the future Day of Judgment souls will be re-embodied (whether in their former but now transfigured earthly bodies or in new resurrection bodies) and will live eternally in the heavenly kingdom.
Within this framework, philosophical discussion has centred mainly on the idea of the immaterial soul and its capacity to survive the death of the body. Plato, in the Phaedo, argued that the soul is inherently indestructible. To destroy something, including the body, is to disintegrate it into its constituent elements; but the soul, as a mental entity, is not composed of parts and is thus an indissoluble unity. Although Aquinas’s concept of the soul, as the “form” of the body, was derived from Aristotle rather than Plato, Aquinas too argued for its indestructibility (Summa theologiae, I, Q. 76, art. 6). The French philosopher Jacques Maritain (1882–1973), a modern Thomist, summarized the conclusion as follows: “A spiritual soul cannot be corrupted, since it possesses no matter; it cannot be disintegrated, since it has no substantial parts; it cannot lose its individual unity, since it is self-subsisting, nor its internal energy since it contains within itself all the sources of its energies” (The Range of Reason, 1952). But though it is possible to define the soul in such a way that it is incorruptible, indissoluble, and self-subsisting, critics have asked whether there is any good reason to think that souls as thus defined exist. If, on the other hand, the soul means the conscious mind or personality—something whose immortality would be of great interest to human beings—this does not seem to be an indissoluble unity. On the contrary, it seems to have a kind of organic unity that can vary in degree but that is also capable of fragmentation and dissolution.
Much modern philosophical analysis of the concept of mind is inhospitable to the idea of immortality, for it equates mental life with the functioning of the physical brain (see mind, philosophy of). Impressed by evidence of the dependence of mind on brain, some Christian thinkers have been willing to accept the view—corresponding to the ancient Hebrew understanding—of the human being as an indissoluble psychophysical unity, but these thinkers have still maintained a belief in immortality, not as the mind surviving the body, but as a divine resurrection or re-creation of the living body-mind totality. Such resurrection persons would presumably be located in a space different from that which they now inhabit and would presumably undergo a development from the condition of a dying person to that of a viable inhabitant of the resurrection world. But all theories in this area have their own difficulties, and alternative theories emerged.
Kant offered a different kind of argument for immortality—as a postulate of the moral life. The claim of the moral law demands that human beings become perfect. This is something that can never be finally achieved but only asymptotically approached, and such an unending approach requires the unending existence of the soul. This argument also is open to criticism. Are humans indeed subject to a strict obligation to attain moral perfection? Might not their obligation, as finite creatures, be to do the best they can? But this does not seem to entail immortality.
It should be noted that the debate concerning arguments about the immortality of the soul and the existence of God has been as much among Christian philosophers as between them and non-Christian thinkers. It is by no means the case that Christian thinkers have all regarded the project of natural theology as viable. There have indeed been, and are, many who hold that divine existence can be definitively proved or shown to be objectively probable. But many others not only hold that the attempted proofs all require premises that a disbeliever is under no rational obligation to accept but also question the evidentialist assumption that the only route to rational theistic belief is by inference from previously accepted evidence-stating premises.
20th-century discussions
Discussion among Christian philosophers during the 20th century was predominantly epistemological. Among Roman Catholic thinkers it included the work of Bernard Lonergan in Insight (1957), which has stimulated considerable discussion. Lonergan argued that the act of understanding, or insight, is pivotal for the apprehension of reality, and that it implies in the long run that the universe is itself due to the fiat of an “unrestricted act of understanding,” which is God. Other Roman Catholic thinkers refined and extended the Thomistic approach, particularly the idea of analogical predication in statements about God. Others, in common with non-Catholic philosophers, have discussed the traditional divine attributes—omniscience, omnipotence, eternity, immutability, personality, goodness. The concept of a finite deity developing through time was also proposed (e.g., by Charles Hartshorne) to meet objections to some of these concepts: If God is immutable, how can God be aware of successive events in time? If God has absolute self-existence, how can God respond with sympathy to the pains of creaturely life? Others defended the traditional attributes as logically coherent, both individually and in their relationship to one another, and as allowing for divine awareness of the created universe, God’s activity in history, and divine sympathy with human suffering.
Influence of logical positivism
Perhaps the largest body of work, however, was generated in dialogue with the linguistic turn of philosophy in the English-speaking world, concentrating on the analysis of language in its various uses. The logical positivist movement originated in the 1920s with the Vienna Circle. Although mainly concerned with the philosophy of science, it posed by implication a major challenge to the logical meaningfulness of religious language. The positivist position, in its developed form, was that a statement has factual meaning only if it is capable in principle of being verified or falsified, or at least in some degree confirmed or disconfirmed, within human experience; otherwise it is meaningless, or cognitively vacuous. In the years immediately after World War II this account of factual meaning was applied (e.g., by Antony Flew) to theological statements, raising such questions as: What observable difference does it make whether it is true or false that “God loves us”? Whatever tragedies occur, do not the faithful still maintain their belief, adding perhaps that the divine love is beyond human comprehension? But if it is not possible to conceive of circumstances in which “God loves us” would have to be judged false, is not the statement factually empty, or meaningless?
This challenge evoked three kinds of response. Some Christian philosophers declared it to be a nonchallenge, on the ground that the positivists never succeeded in finding a precise formulation of the verification criterion that was fully satisfactory even to themselves. Others held that this does not block the central thrust of the positivist challenge. Does it really make no difference within actual or possible human experience whether or not God exists and loves us; and if so, is not the significance of the belief thereby fatally damaged? Among those who felt it necessary to face this challenge, one group granted that theological statements lack factual meaning and suggested that their proper use lies elsewhere, as expressing a way of looking at the world (e.g., Richard M. Hare) or a moral point of view and commitment (e.g., R.B. Braithwaite). The other group claimed that theism is ultimately open to experiential confirmation. The theory of eschatological verification (developed by John Hick) holds that the belief in future postmortem experiences will be verified if true (though not falsified if false), and that in a divinely governed universe such experiences will take forms confirming theistic faith. Thus although the believer and the disbeliever do not have different expectations about the course of earthly history, they do expect the total course of the universe to be radically different.
In the late 20th century, under the stimulus of Wittgenstein’s posthumously published works, attention was directed to the multiple legitimate uses of language in the various language games developed within different human activities and forms of life; and it was suggested that religious belief has its own autonomous validity, not subject to verificationist or scientific or other extraneous criteria. Statements about God and eternal life do not make true-or-false factual claims but express, in religious language, a distinctive attitude to life and way of engaging in it. This suggestion formed part of the broader non-realist interpretation of religion, which held that religious beliefs do not refer to putative transcendent realities but are instead expressive of human ideals, desires, hopes, attitudes, and intentions. Such thinking goes back to the German philosopher Ludwig Feuerbach (The Essence of Christianity, 1841) in the 19th century. It was promoted in the early 20th century by George Santayana, John Dewey, and J.H. Randall, Jr., and later by Christian writers such as D.Z. Phillips and Don Cupitt. According to them, true Christianity consists in the inner purity of an unself-centred attitude to life and does not involve belief in the objective reality of God or of a life after death. This view, however, was criticized on the grounds that to deny the transcendent reference of religious language empties it of any substantial meaning.