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Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

Albert Einstein

Attributed to a 1921 lecture (widely quoted but unverified in his writings) · Checked on 27 February 2026
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.

Analysis

Extensive searches of Einstein's published works, lecture transcripts, and correspondence reveal no instance of this statement. The phrase first appeared in print in the 1970s, long after Einstein's death, and is often traced to secondary sources that cite it without primary evidence. Quote investigators and scholarly references label it a misattribution.

Background

Albert Einstein died in 1955, and the earliest known appearance of the quote dates to a 1972 newspaper column, long after his death. Similar wording appears in earlier jokes about “the universe and human stupidity,” but none are linked to Einstein. The pattern of attributing witty aphorisms to famous scientists is common, and this quote follows that trend.

Verdict summary

The quote is falsely attributed to Albert Einstein and has no verifiable source in his writings or recorded speeches.

Sources consulted

— Quote Investigator: "Two things are infinite..." (https://quoteinvestigator.com/2015/09/03/infinite/)
— Snopes: "Albert Einstein and the 'infinite' quote" (https://www.snopes.com/fact-check/einstein-infinite-universe-stupidity/)
— Einstein Archives Online – Search results for the phrase (https://www.albert-einstein.org/)