We can’t. Mainstream modern theological scholarship on this subject is instructive.
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‘Twentieth century biblical scholarship largely agrees that the ancient Jews had little explicit notion of a personal afterlife until very late in the Old Testament period. Immortality of the soul was a typically Greek philosophical notion quite foreign to the thought of ancient Semitic peoples. Only the latest stratum of the Old Testament asserts even the resurrection of the body, a view more congenial to Semites.’, Donelley, ‘Calvinism and Scholasticism in Vermigli’s doctrine of man and grace’, p. 99 (1976); note that this was written over 30 years ago, and the academic consensus has only strengthened on the issue.
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‘For a Hebrew, ‘soul’ indicated the unity of a human person; Hebrews were living bodies, they did not have bodies. This Hebrew field of meaning is breached in the Wisdom of Solomon by explicit introduction of Greek ideas of soul. A dualism of soul and body is present: ‘a perishable body weighs down the soul’ (9:15). This perishable body is opposed by an immortal soul (3:1-3). Such dualism might imply that soul is superior to body. In the nt, ‘soul’ retains its basic Hebrew field of meaning. Soul refers to one’s life: Herod sought Jesus’ soul (Matt. 2:20); one might save a soul or take it (Mark 3:4). Death occurs when God ‘requires your soul’ (Luke 12:20). ‘Soul’ may refer to the whole person, the self: ‘three thousand souls’ were converted in Acts 2:41 (see Acts 3:23). Although the Greek idea of an immortal soul different in kind from the mortal body is not evident, ‘soul’ denotes the existence of a person after death (see Luke 9:25; 12:4; 21:19); yet Greek influence may be found in 1 Peter’s remark about ‘the salvation of souls’ (1:9). A moderate dualism exists in the contrast of spirit with body and even soul, where ‘soul’ means life that is not yet caught up in grace. See also Flesh and Spirit; Human Being.’, Neyrey, ‘Soul’, in Achtemeier, Harper, & Row (eds.), ‘Harper’s Bible Dictionary’, pp. 982-983 (1st ed. 1985).
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‘Indeed, the salvation of the “immortal soul” has sometimes been a commonplace in preaching, but it is fundamentally unbiblical. Biblical anthropology is not dualistic but monistic: human being consists in the integrated wholeness of body and soul, and the Bible never contemplates the disembodied existence of the soul in bliss.’, Myers (ed.), ‘The Eerdmans Bible Dictionary’, p. 518 (1987).
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‘A particular instance of the Heb. avoidance of dualism is the biblical doctrine of man. Greek thought, and in consequence many Hellenizing Jewish and Christian sages, regarded the body as a prison-house of the soul: sōma sēma ‘the body is a tomb’. The aim of the sage was to achieve deliverance from all that is bodily and thus liberate the soul. But to the Bible man is not a soul in a body but a body/soul unity; so true is this that even in the resurrection, although flesh and blood cannot inherit the kingdom of God, we shall still have bodies (1 Cor. 15:35ff.).’, Cressey, ‘Dualism’, in Cressey, Wood, & Marshall (eds.), ‘New Bible Dictionary’, p. 284 (3rd. ed. 1996).
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‘Modern scholarship has underscored the fact that Hebrew and Greek concepts of soul were not synonymous. While the Hebrew thought world distinguished soul from body (as material basis of life), there was no question of two separate, independent entities. A person did not have a body but was an animated body, a unit of life manifesting itself in fleshly form—a psychophysical organism (Buttrick, 1962). Although Greek concepts of the soul varied widely according to the particular era and philosophical school, Greek thought often presented a view of the soul as a separate entity from body. Until recent decades Christian theology of the soul has been more reflective of Greek (compartmentalized) than Hebrew (unitive) ideas.’, Moon, ‘Soul’, in Benner & Hill (eds.), ‘Baker encyclopedia of psychology & counseling, p. 1148 (2nd ed. 1999).
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‘Even as we are conscious of the broad and very common biblical usage of the term “soul,” we must be clear that Scripture does not present even a rudimentarily developed theology of the soul. The creation narrative is clear that all life originates with God. Yet the Hebrew Scripture offers no specific understanding of the origin of individual souls, of when and how they become attached to specific bodies, or of their potential existence, apart from the body, after death. The reason for this is that, as we noted at the beginning, the Hebrew Bible does not present a theory of the soul developed much beyond the simple concept of a force associated with respiration, hence, a life-force.’, Avery-Peck, ‘Soul’, in Neusner, et al. (eds.), ‘The Encyclopedia of Judaism’, p. 1343 (2000).
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‘Gn. 2:7 refers to God forming Adam ‘from the dust of the ground’ and breathing ‘into his nostrils the breath of life’, so that man becomes a ‘living being’. The word ‘being’ translates the Hebrew word nep̄eš which, though often translated by the Eng. word ‘soul’, ought not to be interpreted in the sense suggested by Hellenistic thought (see Platonism; Soul, Origin of). It should rather be understood in its own context within the OT as indicative of men and women as living beings or persons in relationship to God and other people. The lxx translates this Heb. word nep̄eš with the Gk. word psychē, which explains the habit of interpreting this OT concept in the light of Gk. use of psychē. Yet it is surely more appropriate to understand the use of psychē (in both the lxx and the NT) in the light of the OT’s use of nep̄eš. According to Gn. 2, any conception of the soul as a separate (and separable) part or division of our being would seem to be invalid. Similarly, the popular debate concerning whether human nature is a bipartite or tripartite being has the appearance of a rather ill-founded and unhelpful irrelevancy. The human person is a ‘soul’ by virtue of being a ‘body’ made alive by the ‘breath’ (or ‘Spirit’) of God.’, Ferguson & Packer (eds.),’New Dictionary of Theology’, pp. 28-29 (electronic ed. 2000).
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‘Far from referring simply to one aspect of a person, “soul” refers to the whole person. Thus, a corpse is referred to as a “dead soul,” even though the word is usually translated “dead body” (Lev. 21:11; Num. 6:6). “Soul” can also refer to a person’s very life itself 1 Kgs. 19:4; Ezek. 32:10).“Soul” often refers by extension to the whole person.’, Carrigan, ‘Soul’, Freedman, Myers, & Beck (eds.) ‘Eerdmans Dictionary of the Bible’, p. 1245 (2000).
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‘There is no suggestion in the OT of the transmigration of the soul as an immaterial, immortal entity. Man is a unity of body and soul—terms that describe not so much two separate entities in a person as much as one person from different standpoints. Hence, in the description of man’s creation in Genesis 2:7, the phrase “a living soul” (kjv) is better translated as “a living being.”’, Elwell & Comfort (eds.), ‘Tyndale Bible dictionary, p. 1216 (2001).
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‘It has been noted already that the soul, like the body, derives from God. This implies that man is composed of soul and body, and the Bible makes it plain that this is so. The soul and the body belong together, so that without either the one or the other there is no true man. Disembodied existence in Sheol is unreal. Paul does not seek a life outside the body, but wants to be clothed with a new and spiritual body (1 Cor. 15; 2 Cor. 5).’, Bromiley, ‘Psychology’, in Bromiley, ‘The International Standard Bible Encyclopedia’, volume 3, p. 1045 (rev. ed. 2002).
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‘Nor is any place left for dualism. Soul and body are not separate entities which are able to work in concert by virtue of a preestablished harmony (Leibniz).’ , ibid., p. 1045.
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‘All Christians believe in immortality, understood as a final resurrection to everlasting life. The majority have held that immortality also includes continuing existence of the soul or person between death and resurrection. Almost every detail of this general confession and its biblical basis, however, has been disputed. The debate has been fueled by the development of beliefs about the afterlife within the Bible itself and the variety of language in which they are expressed. The Hebrew Bible does not present the human soul (nepeš) or spirit (rûah) as an immortal substance, and for the most part it envisions the dead as ghosts in Sheol, the dark, sleepy underworld. Nevertheless it expresses hope beyond death (see Pss. 23 and 49:15) and eventually asserts physical resurrection (see Isa. 26:19; Dan. 12:2).’, Cooper, ‘Immortality’, in Fahlbusch & Bromiley (eds.), ‘The Encyclopedia of Christianity’, volume 2, p. (2003).
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‘soul. The idea of a distinction between the soul, the immaterial principle of life and intelligence, and the body is of great antiquity, though only gradually expressed with any precision. Hebrew thought made little of this distinction, and there is practically no specific teaching on the subject in the Bible beyond an underlying assumption of some form of afterlife (see immortality)., Cross & Livingstone, (eds.), ‘The Oxford dictionary of the Christian Church’, p. 1531 (3rd rev. ed. 2005).
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‘The English translation of nepeš by the term “soul” has too often been misunderstood as teaching a bipartite (soul and body—dichotomy) or tripartite (body, soul, and spirit—trichotomy) anthropology. Equally misleading is the interpretation that too radically separates soul from body as in the Greek view of human nature. See body; spirit. N. Porteous (in IDB, 4:428) states it well when he says, “The Hebrew could not conceive of a disembodied nepeš, though he could use nepeš with or without the adjective ‘dead,’ for corpse (e.g., Lev. 19:28; Num. 6:6).” Or as R. B. Laurin has suggested, “To the Hebrew, man was not a ‘body’ and a ‘soul,’ but rather a ‘body-soul,’ a unit of vital power” (BDT, 492). In this connection, the most significant text is Gen. 2:7, “the Lord God formed the man from the dust of the ground and breathed into his nostrils the breath of life [nišmat hayyîm], and the man became a living being [nepeš hayyâ]” (the KJV rendering “living soul” is misleading).’, Lake, ‘Soul’, in Silva & Tenney (eds.), ‘The Zondervan Encyclopedia of the Bible’, volume 5, p. 586 (rev. ed. 2009).
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‘What is essential to understanding the Hebrew mind is the recognition that the human being is a unit: body-soul! The soul is not, therefore, unaffected by the experience of death. OT eschatology does indeed contain seminal elements of hope implying the more positive teaching of the NT, as can be seen in the OT phrase, “rested with his fathers” (1 Ki. 2:10 et al.), in David’s confident attitude toward the death of his child (2 Sam. 12:12–23), and in Job’s hope for a resurrection (Job 19:20–29). It is this essential soul-body oneness that provides the uniqueness of the biblical concept of the resurrection of the body as distinguished from the Greek idea of the immortality of the soul.’, ibid., p. 587.
It means we need to start taking resurrection seriously.
It makes an immortal soul irrelevant.