• In every case, we ought to act that part towards another, which we would judge to be right in him to act toward us, if we were in his circumstances and he in ours; or more generally - What we approve in others, that we ought to practise in like circumstances, what we condemn in others we ought not to do.

    Thomas Reid, Ronald E. Beanblossom, Keith Lehrer (1983). “Thomas Reid's Inquiry and Essays”, p.355, Hackett Publishing