I've argued that many of what philosophers call moral sentiments can be seen in other species. In chimpanzees and other animals, you see examples of sympathy, empathy, reciprocity, a willingness to follow social rules. Dogs are a good example of a species that have and obey social rules; that's why we like them so much, even though they're large carnivores.frans de waal
Subjects who reciprocally recognize each other as such, must consider each other as identical, insofar as they both take up the position of subject; they must at all times subsume themselves and the other under the same category. At the same time, the relation of reciprocity of recognition demands the non-identity of one and the other, both must also maintain their absolute difference, for to be a subject implies the claim of individuation.jürgen habermas
This is a strange fraternity these sea lions and land lions, land unicorns and sea unicorns; the lion civilly rampant, tame and concessive like the long-tailed bear of Ecuador the lion standing up against this screen of woven air which is the forest: the unicorn also, on its hind legs in reciprocity.marianne moore
The need to speak the truth and even to seek it for oneself is only conceivable in so far as the individual thinks and acts as one of a society, and not of any society (for it is just the constraining relations between superior and inferior that often drive the latter to prevarication) but of a society founded on reciprocity and mutual respect, and therefore on cooperation.jean piaget
...far as the individual thinks and acts as one of a society , and not just any society (for it is the constraining relations between superior and inferior that often drive the latter to prevarication) but of a society founded on reciprocity and mutual respect , and therefore on cooperation .Jean Piaget, in The Cambridge Companion to Piaget, p.278
Gossip and reputation make sure that what comes around - a person who is cruel will find that the others are cruel hack to him, and a person who is kind will find others are kind in return. Gossip paired with reciprocity allow karma to work here on earth, not in the next life. As long as everyone plays tit-for-tat augmented by gratitude, vengeance, and gossip, the whole system should work beautifully.p. 55 (The Happiness Hypothesis: Finding Modern Truth in Ancient Wisdom (2005))
I assure you again that under my leadership, Kenya will strive to uphold our international obligations, so long as these are founded on the well-established principles of mutual respect and reciprocity.Quoted on BBC News, 'Uhuru Kenyatta sworn in as Kenyan president" (9 April 2013).
This can be related to other expressions on the ethics of reciprocity, often referred to as the variants of the Golden Rule.Letter LII: On choosing our teachers, line 12.