Epicurus

Justice is a pact of mutual advantage, and nothing sacred about it.

In their words

“Nothing is enough for the man to whom enough is too little.”

Epicurus taught that justice is not a divine command but an agreement among people not to harm one another, valid only while it holds advantage for both sides. His community, the Garden, admitted women and slaves as equals and kept its distance from Athenian politics. That grounding of obligation in consent and mutual benefit is the seed of later contractarian and libertarian argument.