The Golden Rule was upheld by more than religious traditions;
PHILOSOPHERS & moral/ethical systems as well as spiritual teachers:
Socrates: “Do not do to others that which would anger you if others did it to you.” (Greece; 5th century BCE).
Plato: “May I do to others as I would that they should do unto me.” (Greece; 4th century BCE)
Aristotle: “We should behave towards friends, as we would wish friends to behave towards us.” (This is a restricted version of the golden rule limited only towards friends. (Greece; 4th century BCE).
Seneca: a Roman Stoic philosopher: “Treat your inferiors as you would be treated by your superiors,” Epistle to Lucilius 47:11
Epictetus: “What you would avoid suffering yourself, seek not to impose on others.” (Turkey, Rome, Greece; circa 100 CE)
Thomas Hobbs: (England; 17th century CE) “Do not that to another which thou wouldst not have done to thyself.”
“When any one questions whether what he plans to do to another will be done in accordance with the law of nature or not, let him imagine himself in the other man’s place.”
Kant: “Act as if the maxim of thy action were to become by thy will a universal law of nature.” (Germany; 18th century CE)
John Stuart Mill: “To do as you would be done by, and to love your neighbor as yourself, constitute the ideal perfection of utilitarian morality.” (Britain; 19th century CE)
“…critical intelligence, infused by a sense of human caring, is the best method that humanity has for resolving problems. Reason should be balanced with compassion and empathy and the whole person fulfilled.” Humanist Manifesto II; Ethics section.
“Don’t do things you wouldn’t want to have done to you, British Humanist Society.