Full Idea
To check whether we are following public reason we might ask: how would our argument strike us presented in the form of a supreme court opinion?
Gist of Idea
Check your rationality by thinking of your opinion pronounced by the supreme court
Source
John Rawls (Political Liberalism [1993], p.254), quoted by Michael J. Sandel - Justice: What's the right thing to do? 10
Book Reference
Sandel,Michael J.: 'Justice: what's the right thing to do?' [Penguin 2010], p.249
A Reaction
A very nice practical implementation of Kantian universalisability. How would your opinion sound if it were written into a constitution?