Eternity, also sempiternity or forever, or perpetuity, is time with no end, i.e. infinite.
In the context of human life, eternity and death are co-existing realities.
Etymology
Cicero used the word aeternitatis, in the work: De Inventione 1, 27, 39., written at some time between the years 88 - 81 BC which is an early or the earliest extant written form from which the English word is derived; first shown in history in a circa 1374 translation by Chaucer. The first usage in French is 1175: eternitez: B. de Ste-Maure, within 'ducs de Normandie.
The ancient Greek word for everlastingness was ἀίδιος (aidios) as exists via Plotinus, who also used the word aoin (eternity), in Ennead III.7.
17th century
Thomas Hobbes was re-stating the sense of the definition of Boethius when published 1662, as a response to John Wallis, he wrote that he considered that "eternity is a permanent now".
Eternity as infinite duration is an important concept in many lives and religions. God or gods are often said to endure eternally, or exist for all time, forever, without beginning or end. Religious views of an afterlife may speak of it in terms of eternity or eternal life.
Jesus In the Gospels explicitly threatens the wicked with an eternal punishment. In the context of Revelation 14: 9-11 of the Bible, the book Revelation describes how smoke from application of burning sulphur onto those who worship the beast will transit upwardly forever. The position onto which sinners are condemned for all time into hell, if the souls are punished in a conscious state of existence, is known as traditionalism, and annihilationism if the punishment on arrival in the infernal dominion is that their consciousness is then annulled-extincted. Thomas Aquinas (c. 1225 – 1274) believed in an eternal God, without either a beginning or end; the concept of eternity is of divine simplicity, thus incapable of being defined or fully understood by humankind. Christian theologians may regard immutability, like the eternal Platonic forms, as essential to eternity.
Ancient Egyptian eternity terms were neheh, for cyclical time, and djet, for linear. Rameses III (c.1187-1156 B.C.E.) funerary temple was: 'United-with -Eternity'.
The ancient greek word for everlasting, and/or eternal, exists in the Orphica Hymni.
The timelessness in divinity of classical period Augustine (354–430 AD), as exists in Book XI of the Confessions, and Boethius (c. 480–524), in Book V of the Consolation of Philosophy were adopted as the reality of the subject for later thinkers in the western tradition of philosophy. Boethius stated eternity was: interminabilis vitae tota simul et perfecta possessio, which is translated as "simultaneously full and perfect possession of interminable life". and nunc permanens, which in English is a: permanent now.
Folk art allegorical map "The 3 Roads to Eternity" from Matthew 7:13–14 by the woodcutter Georgin François (1801–1863) in 1825
Graphic art
Some of the works of MC Escher were explorations of the idea of eternity.
Symbolism
Eternity is often symbolized by the endless snake, swallowing its own tail, the ouroboros. The circle, band, or ring is also commonly used as a symbol for eternity, as is the mathematical symbol of infinity, . Symbolically, these are reminders that eternity has no beginning or end.
↑tempus autem est—id quo nunc utimur, nam ipsum quidem generaliter definire difficile est—pars quaedam aeternitatis cum alicuius annui, menstrui, diurni nocturnive spatii certa significatione.
↑In the Iliad attributed to Homer (c. 8th century BC) the gods are ἀθάνατος (ἀθανασία) καὶ ἀγήρως (appearance physically never any older through time)
When the father creator saw the creature which he had made moving and living, the created image of the eternal gods, he rejoiced, and in his joy determined to make the copy still more like the original; and as this was eternal, he sought to make the universe eternal, so far as might be. Now the nature of the ideal being was everlasting, but to bestow this attribute in its fulness upon a creature was impossible. Wherefore he resolved to have a moving image of eternity, and when he set in order the heaven, he made this image eternal but moving according to number, while eternity itself rests in unity; and this image we call time.
the Living Being that is for ever existent, he sought to make this universe also like it, so far as might be, in that respect. on the generated thing. But he took thought to make, as it were, a moving likeness of eternity; and, at the same time that he ordered the Heaven, he made, of eternity that abides in unity, an everlasting likeness moving according to number—that to which we have given the name Time.
—translated in 1937
↑his politics, that were: "a revolutionary voluntarism - sometimes led Blanqui to failure - nevertheless saved him from the straitjacket [marais gluant] of 'scientific' determinism."
↑For examples: Bassali (2008), p.138, quote: "In the next life, there will be two places only - heaven and hell. ... In heaven, you will spend an eternity of bliss, light, and glory with God. In hell, you will spend an eternity of woe, darkness and torment apart from God. Which of these two places would you prefer to spend your eternity?"
↑Deng (2018), quote: "Augustine connects God's timeless eternity to God's being the cause of all times and God's immutability."
↑Boethius (523), book 5, prose §. 6, quote: "Aeternitas igitur est interminabilis uitae tota simul et perfecta possessio"
↑She holds up an hourglass, her elbow above a human skull and in her lower hand two flowers in maturity, one of which is a dandelion blowball or clock (seed head), reminders of transience. An Ouroboros, snake swallowing its own tail, floats above her head as a halo - symbols of eternity.
↑Thomas Nashe (1599). Nina Green (ed.). Nashe's Lenten Stuff(PDF). oxford-shakespeare.com. p.16. Archived(PDF) from the original on August 3, 2016. Retrieved December 31, 2025.
↑Noah Webster (1856). "ETH EUD". A Dictionary of the English Language Exhibiting the Origin, Orthography, Pronunciation and Definitions of Words. George Routledge & Company. p.369. Eternity the state or time after death: as, at death we enter on eternity
↑А. А. Зайцев. "ВЕЧНОСТЬ" (in Russian). pravenc.ru Церковно-научный центр «Православная Энциклопедия». Archived from the original on January 3, 2026. Понятие В. в главных чертах было сформировано в античной философии. - наиболее полное развитие получило в платонической традиции (Plat. Tim.; Plot. Enn. III 7. 1-4; Procl. In Tim. 11)
↑Ministerstwa Edukacji Narodowej. "when and where did classical antiquity begin?". zpe.gov.pl. gov.pl. Archived from the original on May 16, 2026. the collapse of the Western Roman Empire in 473 CE. - Classical antiquity is the period in the culture of Greece and Rome from around the ninth century BC (the times of Homer) until the fall of the Western Roman Empire in the fifth century CE
↑Robert Parker (March 7, 2016). "Aion: Extract". Oxford Classical Dictionary. Oxford University Press. doi:10.1093/acrefore/9780199381135.013.227. In early Greek αἰών means...'whole lifetime'...perhaps through application to the kosmos, the lifetime of which is never-ending, that the word acquired the sense of eternity (cf. Pl. Ti. 37d; Arist. Cael. 279a23–8)
↑Aristotle. "Book I. 9". De Caelo(PDF). Translated by J. L. Stocks; H. B. Wallis. St John's College, Oxford University: Humphrey Milford 1922. p.279, lines 25-28, footnote – via Robert Parker (2016) Oxford Classical Dictionary doi.org/10.1093/acrefore/9780199381135.013.227. On the same principle the fulfilment of the whole heaven, the fulfilment which includes all time and infinity, is 'duration' a name based upon the fact that it is always1 duration immortal and divine.1 αἰών is derived from άεἰ ὢν. (Preface textual notes - Prantl taken as basis.)
↑J.R.G.; J.C.B. (1880). "Letter VIII". A Discussion on the Doctrine of Endless Punishment Between Rev. J.R. Graves, D. D., L. L. D., Editor of "The Baptist," Memphis Tenn. and Rev. John C. Burruss, Editor of the "Universalist Herald" Notasulga Ala. Atlanta, Ga.: J.O. Perkins & Co. p.136.
↑Giannis Stamatellos (December 2013). Eternity in Plotinus: Abstract. Athens: DEREE-Αμερικανικό Κολλέγιο Ελλάδος– via Giannis Stamatellos (2007) Plotinus and the Presocratics: A Philosophical Study of Presocratic Influences in Plotinus' Enneads: "Plotinus’ central discussion on eternity (αἰών) and time (χρóνος) appears in Ennead III.7, On Eternity and Time." SUNY Press.
12Oleh Uwe Hummel (June 2016). "NAMA ALLAH: DIMULIAKAN ATAU DIPERALAT?"(PDF). PAMBELUM: Jurnal Teologi Kontekstual (in Indonesian). 6 (1). Sekolah Tinggi Teologi Gereja Kalimantan Evangelis: stt-gke.ac.id: 9. El –Olam: Nama םל וֹע לאberarti "Allah yang Kekal". Olam sebenarnya berarti jagad raya (universe) atau kekekalan (eternity). El Olam identik dengan "TUHAN" (הוהי), yaitu Allah yang disembah oleh para leluhur Israel di Bersyeba (lihat Kej. 21:33; Maz. 90:1-3; Yes.26:4).
↑D. A. Ziborova. "Time-Eternity: Ancient Egyptian Temporal Concept in the Context of Ancient Greek Philosophy". UDC. 94 (32). V. N. Karazin Kharkiv National University: 79. ancient Egyptians temporal categories: nHH (neheh) and Dt (djet) and their comparison with the tradition of ancient Greek philosophy. It is shown that these terms can be defined as time-eternity. Attention is focused on the definition of the term nHH as associated with the solar god and the cyclic movement, innite duration of recovery and cyclic length, and term Dt as the eternity associated with Osiris, the other world of the dead, imperishableness, constancy and "eternal sameness".
↑Janice Kamrin (February 1, 2017). "Timeline of Art History Telling Time in Ancient Egypt". 1000 Fifth Avenue New York: The Metropolitan Museum of Art. Archived from the original on January 15, 2026. Retrieved December 29, 2025. two kinds of eternity. Linear time, or djet, associated with the funerary god Osiris, had a beginning and would have an end, albeit in the infinitely far future. Neheh, cyclical time, was tied to the passage of the sun through the sky during the day and the Netherworld during the night. Ideally, an Egyptian who had lived according to the precepts of maat by supporting and maintaining the proper order of a just cosmos, and who had been accorded a proper burial, would live forever (djet) and ever (neheh).{{cite web}}: CS1 maint: location (link)
↑Deng, Natalja. Edward N. Zalta; Uri Nodelman (eds.). "Eternity The loci classici". The Stanford Encyclopedia of Philosophy (Spring 2025 Edition). (Following the work of Boethius and Augustine)" [of Thagaste] "(divine timelessness became the dominant view.)...what came to be the dominant account of eternity in western philosophy and theology
Boedder, Bernard (1902). Natural Theology. Longmans, Green, and Co. Archived from the original on March 26, 2023. Retrieved July 29, 2022– via University of Notre Dame.