From Longman Dictionary of Contemporary Englishgolden ruleˌgolden ˈrule noun [countable] MAINa very important principle, way of behaving etc that should be remembered The golden rule of cooking is to use fresh ingredients.
Examples from the Corpus
golden rule• My golden rule of cooking is to use the best of fresh ingredients.• Aspiring rock artists should remember one golden rule when dealing with the press: there are no rules.• They discovered and applied the golden rule of leading change: Do unto yourself what you would have others do unto themselves.• In terms of the golden rule of change, it caused them to do unto themselves what they wanted others to do.• Remember the golden rule of legal PR-keep the client in the picture.Golden Rule, TheThe Golden RuleGolden Rule, The an idea from the Bible that people should treat others in the way that they want to be treated themselves I've always tried to live by The Golden Rule. 