The Golden Rule

Ancient Greek philosophy
http://en.wikipedia.org/wiki/Ethic_of_reciprocity#Ancient_Greek_philosophy
The Golden Rule was a common principle in ancient Greek philosophy.
A few examples:
"Do not to your neighbor what you would take ill from him." (Pittacus)[3]
"Avoid doing what you would blame others for doing." (Thales)[4]
"What you wish your neighbors to be to you, such be also to them." (Sextus the Pythagorean)[5]
"Do not do to others what would anger you if done to you by others." (Isocrates)[6]
"What thou avoidest suffering thyself seek not to impose on others." (Epictetus)[7]
"It is impossible to live a pleasant life without living wisely and well and justly (agreeing 'neither to harm nor be harmed'[8]), and it is impossible to live wisely and well and justly without living a pleasant life." (Epicurus)[

Ethic of reciprocity
From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Ethic_of_reciprocity

It has been suggested that Norm of reciprocity be merged into this article or section. (Discuss) The Parable of the Good Samaritan
The ethic of reciprocity (also known as the Golden Rule) is an ethical code that states one has a right to just treatment, and a responsibility to ensure justice for others. Reciprocity is arguably the most essential basis for the modern concept of human rights, though it has its critics.
The norm of reciprocity is the social expectation that people will respond to each other in kind -- returning benefits for benefits, and responding with either indifference or hostility to harms. The social norm of reciprocity often takes different forms in different areas of social life, or in different societies. All of them, however, are distinct from related ideas such as gratitude, the Golden Rule, or mutual goodwill. See Reciprocity (social and political philosophy) for an analysis of the concepts involved.
http://en.wikipedia.org/wiki/Norm_of_reciprocity

http://en.wikipedia.org/wiki/Reciprocity_(social_and_political_philosophy)