“Two great poets are stronger than two thousand mediocrities”

Listen the to actual quoted words: https://www.youtube.com/watch?v=2nf_bu-kBr4
1963 statement, as quoted in The Quote Verifier : Who Said What, Where, and When (2006) by Ralph Keyes, p. 82
Meet the Press (1965), as quoted in The Quote Verifier : Who Said What, Where, and When (2006) by Ralph Keyes, p. 82
The numbers cited in paraphrases of this quote often vary from 100 to 2000.
Unsourced variant: I would rather be governed by the first 2000 names in the Boston phone book than by the 2000 members of the faculty of Harvard University.
Variant: I would rather be governed by the first two thousand people in the Boston telephone directory than by the two thousand people on the faculty of Harvard University.

Parnassus, Preface

Letter to A.W.M. Baillie (10 September 1864)
Letters, etc

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 601.

Letter to Paul Cézanne (16 April 1860), as published in Paul Cézanne : Letters (1995) edited by John Rewald.

Source: Aleph

Was written in a slightly different way by Leo Longanesi in Italian, above form has been attributed to Kafka without evidence.
Misattributed
Source: One Idiot Is One Idiot. Two Idiots Are Two Idiots. Ten Thousand Idiots Are a Political Party, Quote Investigator, 2021-10-08 https://quoteinvestigator.com/2021/10/08/idiots/,