golden rule
US /ˌɡoʊl.dən ˈruːl/
UK /ˌɡoʊl.dən ˈruːl/
1.
the principle of treating others as one would wish to be treated oneself
:
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Always remember the golden rule: treat others as you want to be treated.
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The principle of the golden rule is found in many cultures and religions.