Marcus Aurelius
Meditations 5.35
If this is neither my own badness, nor an effect of my own badness, and the common weal is not injured, why am I troubled about it, and what is the harm to the common weal?
Marcus Aurelius, Meditations 5.35, translated by George Long
If this be no vice of mine nor the outcome of any vice of mine, and if the common interest does not suffer, why concern myself about it? And how can the common interest suffer?
Marcus Aurelius, Meditations 5.35, translated by C. R. Haines