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Everything is all that exists.[1] Every object and entity is a part of everything, including all physical bodies and in some cases all abstract objects. Everything is generally defined as the opposite of nothing, although an alternative view considers "nothing" a part of everything.

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In ordinary conversation, everything usually refers only to the totality of things relevant to the subject matter.[1] When there is no expressed limitation, everything may refer to the universe or the world. The Universe is most commonly defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum, and the physical laws and constants that govern them. However, the term "universe" may be used in slightly different contextual senses, denoting such concepts as the cosmos, the world or Nature. According to some speculations, this universe may be one of many disconnected universes, which are collectively denoted as the multiverse. In one theory, there is an infinite variety of universes, each with different physical constants. In another theory, new universes are spawned with every quantum measurement. By definition, these speculations cannot currently be tested experimentally, yet, if they exist, they would still be part of everything.

Especially in a metaphysical context, World may refer to everything that constitutes reality and the Universe: see World (philosophy). However, world may "only" refer to Earth envisioned from an anthropocentric or human worldview, as a place inhabited by human beings. It is often used to signify the sum of human experience and history, or the "human condition" in general.[2]

In theoretical physics

In theoretical physics, a theory of everything (TOE) is a hypothetical theory that fully explains and links together all known physical phenomena. Initially, the term was used with an ironic connotation to refer to various overgeneralized theories. For example, a great-grandfather of Ijon Tichy — a character from a cycle of Stanisław Lem's science fiction stories of 1960s — was known to work on the "General Theory of Everything". Over time, the term stuck in popularizations of quantum physics to describe a theory that would unify or explain through a single model the theories of all fundamental interactions of nature.

There have been many theories of everything proposed by theoretical physicists over the last century, but none have been confirmed experimentally. The primary problem in producing a TOE is that the accepted theories of quantum mechanics and general relativity are hard to combine.

Based on theoretical holographic principle arguments from the 1990s, many physicists believe that 11-dimensional M-theory, which is described in many sectors by matrix string theory, and in many other sectors by perturbative string theory, is the complete theory of everything. Other physicists disagree.

In philosophy

In philosophy, a theory of everything or TOE is an ultimate, all-encompassing explanation of nature or reality.[3][4][5] Adopting the term from physics, where the search for a theory of everything is ongoing, philosophers have discussed the viability of the concept and analyzed its properties and implications.[3][4][5] Among the questions to be addressed by a philosophical theory of everything are: "Why is reality understandable?" "Why are the laws of nature as they are?" "Why is there anything at all?"[3]


At one time or another mortal man has worshiped everything on the face of the earth, including himself. He has also worshiped about everything imaginable in the sky and beneath the surface of the earth. Primitive man feared all manifestations of power; he worshiped every natural phenomenon he could not comprehend. The observation of powerful natural forces, such as storms, floods, earthquakes, landslides, volcanoes, fire, heat, and cold, greatly impressed the expanding mind of man. The inexplicable things of life are still termed "acts of God" and "mysterious dispensations of Providence."[1]

Further reading


  1. "everything". Merriam-Webster Online Dictionary. Retrieved 2008-06-17.
  2. "This is the excellent foppery of the world..." — Shakespeare, King Lear, I.ii
  3. Rescher, Nicholas (2006a). "Holistic Explanation and the Idea of a Grand Unified Theory". Collected Papers IX: Studies in Metaphilosophy.
  4. Rescher, Nicholas (2006b). "The Price of an Ultimate Theory". Collected Papers IX: Studies in Metaphilosophy.
  5. Walker, Mark Alan (March 2002). "Prolegomena to Any Future Philosophy". Journal of Evolution and Technology Vol. 10.