Do unto others as you would have them do unto you.
This is called the Golden Rule of ethics and has been stated by many people in many places at many times, and so no one religion or philosophy can lay claim to it. This maxim deserves the top spot on any philosophical one-liner list because it so neatly sums up a system of ethics by which many people live their lives. The statement is a challenge as well as an instruction – we must try to empathize with others to understand how we ourselves would wish to be treated if in the other person’s place. There may be exceptions to the rule and it may not be sufficient to a complete moral doctrine, but as a simple rule for daily life it is hard to think of something which would so improve everyone’s lives if put universally into effect.