those who say it cannot be done should not interrupt those doing it

English dictionary entry

Meanings

proverb
  1. People who dispute that a task is possible should not impede those people who attempt to do it.

Word forms

those who say it cannot be done should not interrupt those doing it

Etymology

Possibly from a Chicago newspaper in 1903: “Things move along so rapidly nowadays that people saying: ‘It can’t be done,’ are always being interrupted by somebody doing it.” https://www.nytimes.com/2018/06/12/world/asia/ivanka-trump-china-summit-korea.html

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