“No man can visualize four dimensions, except mathematically … I think in four dimensions, but only abstractly. The human mind can picture these dimensions no more than it can envisage electricity. Nevertheless, they are no less real than electro-magnetism, the force which controls our universe, within, and by which we have our being.”

— Albert Einstein

1920s, Viereck interview (1929)

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Albert Einstein 702

German-born physicist and founder of the theory of relativi… 1879–1955

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“I see a clock, but I cannot envision the clockmaker. The human mind is unable to conceive of the four dimensions, so how can it conceive of a God, before whom a thousand years and a thousand dimensions are as one?”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

From Cosmic Religion: with Other Opinions and Aphorisms (1931), Albert Einstein, pub. Covici-Friede. Quoted in The Expanded Quotable Einstein, Princeton University Press; 2nd edition (May 30, 2000); Page 208, ISBN 0691070210
1930s

“Evolution has ensured that our brains just aren't equipped to visualise 11 dimensions directly. However, from a purely mathematical point of view it's just as easy to think in 11 dimensions, as it is to think in three or four.”

Stephen Hawking (1942–2018) British theoretical physicist, cosmologist, and author

As quoted in "Return of the time lord" in The Guardian http://books.guardian.co.uk/departments/scienceandnature/story/0,6000,1579384,00.html (27 September 2005)

“Whereas the conception of space and time as a four-dimensional manifold has been very fruitful for mathematical physicists, its effect in the field of epistemology has been only to confuse the issue. Calling time the fourth dimension gives it an air of mystery. One might think that time can now be conceived as a kind of space and try in vain to add visually a fourth dimension to the three dimensions of space. It is essential to guard against such a misunderstanding of mathematical concepts. If we add time to space as a fourth dimension it does not lose any of its peculiar character as time. …Musical tones can be ordered according to volume and pitch and are thus brought into a two dimensional manifold. Similarly colors can be determined by the three basic colors red, green and blue… Such an ordering does not change either tones or colors; it is merely a mathematical expression of something that we have known and visualized for a long time. Our schematization of time as a fourth dimension therefore does not imply any changes in the conception of time. …the space of visualization is only one of many possible forms that add content to the conceptual frame. We would therefore not call the representation of the tone manifold by a plane the visual representation of the two dimensional tone manifold.”

Hans Reichenbach (1891–1953) American philosopher

The Philosophy of Space and Time (1928, tr. 1957)

“The triangles that we can measure are not large enough… to detect the curvature. Fortunately, however, we are, in a way, able to communicate with the fourth dimension. The theory of relativity has given us an insight into the structure of the real universe: …a four-dimensional structure. The study of the way in which the three space-dimensions are interwoven with the time-dimension affords a kind of outside point of view of the three-dimensional space… from this outside point of view we might be able to perceive the curvature of the three-dimensional world.”

Willem de Sitter (1872–1934) Dutch cosmologist

Kosmos (1932)

“The concept of an independent "spiritual realm" does not augment, for me, the magic of the mystical dimension, whereas to think of this dimension as emergent from our minds makes it all the more wondrous to be a human.”

Ursula Goodenough (1943) American biologist

As quoted in The Faith of Scientists : In Their Own Words (2008) by Nancy K. Frankenberry, p. 491

“The driving forces of the universe, the framework upon which it is built up in all its parts, belong to another phase of manifestation than our physical plane, having other dimensions than the three to which we are habituated, and perceived by other modes of consciousness than those to which we are accustomed.”

Dion Fortune (1890–1946) British occultist and author

Dion Fortune, Psychic Self-Defense

“The grand design of nature perceived broadly in four dimensions, including the forces that move the universe and created man, with special focus on evolution in our own biosphere, is something intrinsically good that it is right to preserve and enhance, and wrong to destroy and degrade.”

Roger Wolcott Sperry (1913–1994) American neuroscientist

Source: Science and the Problem of Values (1972), p. 127

“The cosmos is extremely complex… Earth is nothing but a speck of dust, and it is insignificant. Yet within this expanse there are innumerable and complex structures of dimensions. What are these structures of dimensions like? … Which level of dimension does our humankind live in? We live in the surface matter comprised of the biggest layer of molecular particles; we live in between molecules and planets—a planet is also a particle, and within the vast cosmos, it, too, is a trivial speck of dust. The Milky Way Galaxy is also a trivial speck of dust. This universe—the small universe I just described—is also but a trivial speck of dust. The largest particles that our human eyes see are planets, and the smallest particles visible to humankind are molecules. We humans exist in between the particles of molecules and planets. Being in this dimension, you think it’s vast; from a different perspective, it’s actually extremely narrow and tiny.”

Li Hongzhi (1951) Chinese religious leader and dissident

Falun Buddha Fa Lectures in United States http://www.falundafa.org/book/eng/mgjf.htm

“There is a fifth dimension beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity.”

Rod Serling (1924–1975) American screenwriter

First introduction to The Twilight Zone television series; first episode (2 October 1959).
The Twilight Zone
Context: There is a fifth dimension beyond that which is known to man. It is a dimension as vast as space and as timeless as infinity. It is the middle ground between light and shadow, between science and superstition, and it lies between the pit of man's fears and the summit of his knowledge. This is the dimension of imagination. It is an area which we call the Twilight Zone.

“Our lives can only be lived forward and understood backwards. Living a life and understanding it occupy different dimensions.”

Hanif Kureishi (1954) English playwright, screenwriter, novelist

Source: Collected Stories

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