You roll my log, and I will roll yours.

The saying expresses a transactional model of cooperation: help is offered not as a gift but as an exchange—"I’ll do something for you if you do something for me." In later moral and political discourse this idea often shades into critique, implying quid‑pro‑quo favoritism, patronage, or mutual back-scratching rather than principled generosity. Attributing it to Seneca would fit common Roman discussions of beneficium (benefits/favors) and the ethics of giving, where Seneca distinguishes true beneficence from self-interested bargaining. However, without a secure textual locus, it is safest to treat the line as a proverbial sentiment sometimes linked to Seneca rather than a firmly documented Senecan quotation.