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Set a good example of what America means for the generations to come. They will need it.

Timothy Snyder (b. 1969) American historian, author
On Tyranny: Twenty Lessons from the Twentieth Century, ch. 18 (2017)
Added on 11-Aug-21 | Last updated 11-Aug-21
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If a man makes a slip, admonish him gently and show him his mistake. If you fail to convince him, blame yourself, or else blame nobody.

Marcus Aurelius (AD 121-180) Roman emperor (161-180), Stoic philosopher
Meditations, Book 10, #4
Added on 1-Mar-16 | Last updated 1-Mar-16
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Never give children a chance of imagining that anything exists in isolation. Make it plain from the very beginning that all living is relationship. Show them relationships in the woods, in the fields, in the ponds and streams, in the village and in the country around it. Rub it in.

Aldous Huxley (1894-1963) English novelist, essayist and critic
Island (1962)
Added on 12-Nov-14 | Last updated 14-Mar-18
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If we would guide by the light of reason, we must let our minds be bold.

Louis Brandeis (1856-1941) American lawyer, activist, Supreme Court Justice (1916-39)
New State Ice Co. v. Liebmann, 285 U.S. 262 (1932) [dissent]
Added on 4-Nov-14 | Last updated 4-Nov-14
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You do not really understand something unless you can explain it to your grandmother.

Albert Einstein (1879-1955) German-American physicist

Alternate versions:
  • "If you can't explain something to a six-year-old, you really don't understand it yourself."
  • "If you can't explain it simply, you don't understand it well enough."
No source found. The quote is frequently also attributed to Richard Feynman.  It is likely based on a similar quote by Ernest Rutherford.

The closest reference to it can be found in Ronald W. Clark, Einstein: The Life and Times (1972):
To de Broglie, Einstein revealed an instinctive reason for his inability to accept the purely statistical interpretation of wave mechanics. It was a reason which linked him with Rutherford, who used to state that "it should be possible to explain the laws of physics to a barmaid." Einstein, having a final discussion with de Broglie on the platform of the Gare du Nord in Paris, whence they had traveled from Brussels to attend the Fresnel centenary celebrations, said "that all physical theories, their mathematical expressions apart ought to lend themselves to so simple a description 'that even a child could understand them.'"

More discussion of this quotation here.
Added on 15-Jul-11 | Last updated 21-Feb-21
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