Not Only Is The Universe Stranger

This quote is widely attributed to Heisenberg and sourced to Across the Frontiers (1974), but Quote Investigator found the attribution unsupported by primary evidence and traced the underlying idea to the biologist J. B. S. Haldane, who published the sentiment in 1927 as "the universe is not only queerer than we suppose, but queerer than we can suppose." The earliest known appearance under Heisenberg's name is in a 1986 novel. The thought is philosophically consistent with Heisenberg's documented views on the limits of human language and classical concepts when applied to quantum phenomena, but the specific wording should be treated as of uncertain provenance.