What is yours is mine, and all mine is yours.

Taken at face value, the line expresses an ideal of complete mutuality: property and advantage are held in common, and the boundary between “yours” and “mine” dissolves. In Plautine comedy, however, such language is often deployed with irony—characters use extravagant professions of friendship, hospitality, or devotion to flatter, cajole, or manipulate. Read in that comic key, the sentiment can signal either genuine intimacy (as between lovers or close allies) or a performative claim meant to secure access to another’s resources. The quote’s enduring appeal lies in its compact formulation of reciprocity, while its Plautine pedigree invites suspicion about whether the speaker truly means it.