“(…) the bottom line is that if you believe in an external reality independent of humans, then you must also believe that our physical reality is a mathematical structure. Nothing else has a baggage-free description. In other words, we all live in a gigantic mathematical object—one that’s more elaborate than a dodecahedron, and probably also more complex than objects with intimidating names such as Calabi-Yau manifolds, tensor bundles and Hilbert spaces, which appear in today’s most advanced physics theories. Everything in our world is purely mathematical—including you.”
Our Mathematical Universe: My Quest for the Ultimate Nature of Reality (2014)
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Max Tegmark 24
Swedish-American cosmologist 1967Related quotes

“I also believe there is nothing more surreal and nothing more abstract than reality.”
from an interview, 1955; as quoted in Morandi 1894 – 1964, ed: M. C. Bandera & R. Miracco, Museo d'Arte Moderna di Bologna, 2008; p. 38
1945 - 1964

Source: The Sex Sphere (1983), p. 133-134

Preface p. v
A History of Greek Mathematics (1921) Vol. 1. From Thales to Euclid

1920s, Sidelights on Relativity (1922)

Source: Linear programming and extensions (1963), p. 2