Full Idea
Men can be most effectively deterred from committing injustice if those who are not injured feel as much indignation as those who are.
Gist of Idea
The greatest deterrence for injustice is if uninjured parties feel as much indignation as those who are injured
Source
report of Solon (reports [c.600 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 01.So.10
Book Reference
Diogenes Laertius: 'Diogenes Laertius', ed/tr. Yonge,C.D. [Henry G. Bohn 1853], p.28