Catholic theologian Hans Küng explores several perspectives on the notion of eternal life in his book, “Eternal Life? Life After Death as a Medical, Philosophical, and Theological Problem” (1984). In one, Küng describes eternal life not continuing in a linear temporal fashion as either blissful or suffering damnation, but rather as states of mind, and crossing into or out of them as potentially radical transformation into new states of being in the world. However, he cautions against the absolutizing of life in the here and now; “the craving for a quick seizure and a rapid living out of life’s opportunities… the consequence of which is an ideology of thoughtless enjoyment of life, consumerism as the ideology of unrestrained availability of consumer goods” (1984, p. 189).

Küng summons philosopher Immanuel Kant to elucidate the image of an eternal life through spiritual immortality as a precondition for ethical behaviour, where “without a balance between virtue and destiny the whole moral order of the world would be called into question” (1984, p. 75). This theme of a perpetuating soul arises in all three Abrahamic traditions as well as in Hinduism and Jainism, and, according to author Alan Wallace, in Tibetan Buddhism “your psyche emerged sometime while you were in your mother’s womb. Its continuing to evolve and eventually its going to implode back into the substrate, carry on as a disembodied continuum of consciousness and then reincarnate” (2010, p. 155).

Does consciousness reside in the physical self? Can there be scientific truth to notions of a spiritual hereafter or to eastern doctrines of rebirth? What happens to the electrical and chemical activity which forms the state-space of our conscious selves and all its corresponding information when we die? Does it evaporate and dissipate, or transmigrate?

Science philosopher Karl Popper sees upsides of epistemological juxtaposition in that purely metaphysical ideas, and therefore philosophical ideas, have “furthered the advance of science throughout its history” (1935, p. 16). Theoretical physicist Werner Heisenberg, pioneer in the study of quantum mechanics, states we need to instead think more subtly about how we cleave the universe into its subjective and objective parts, as Küng quotes him, “In the astronomical universe, the earth is merely a tiny spec of dust in one of the innumerable galaxies, but, for us, it is the center of the universe” (1984, p. 209).

Physicist Lee Smolin, in describing David Bohm’s Pilot wave theory, sees the quantum mechanical wave function as sprouting “multiple branches that flow to where their particles or configurations are not” despite the particle only being able to follow one of them. The potential of the other empty branches can be ignored: “We are real only once and live that life on that one occupied branch. We need care about and be responsible for only what the real version of each of us does” (2019, p. 127). This sentiment is echoed by Küng in another view of eternal life as dissolving oneself into a unity where “what matters is to work together with others who are living with us – out of hope for an eternal life and in commitment for a better human world – for a practical life at the present time” (1984, p. 222).

We may not have different lives in some sense of the word, but do we have an eternal life nonetheless? Whether through the reverberations of our actions, be they good or bad, in this lifetime, or through the wave function itself, carrying some state of us forward, even after we die?

A Sheaf of Golden Rules from Twelve Religions | Jainism:
“Indifferent to worldly objects, a man should wander about treating all creatures in the world as he himself would be treated” (1946, p. 309).

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Heisenberg, W. (1973), “Naturwissenschaftliche und religiose Wahrheit”, in Küng, H. (1984) Eternal Life? Life After Death as a Medical, Philosophical, and Theological Problem, translated by Edward Quinn. Garden City, United States: Doubleday & Company Inc.

Hoople, R. E., Piper, R. F., & Tolley, W. P. (Eds.), (1946), A Sheaf of Golden Rules from Twelve Religions, in Preface to Philosophy: Book of Readings (pp. 309-310). New York, United States: The Macmillan Company (1952 ed.)

Küng, H. (1984) Eternal Life? Life After Death as a Medical, Philosophical, and Theological Problem, translated by Edward Quinn. Garden City, United States: Doubleday & Company Inc.

Popper, K. (1935) The Logic of Scientific Discovery. London, United Kingdom: Routledge Classics (2002 ed.)

Smolin, L. (2019) Einstein’s Unfinished Revolution: The Search for What Lies Beyond the Quantum. Toronto, Canada: Alfred A. Knopf – Penguin Random House

Wallace, A. (2010), in Paulson, S. (Ed.), Atoms and Eden: Conversations on Religion and Science (pp. 145-157). New York, United States: Oxford University Press