Marcus Aurelius
Meditations 11.38
The dispute then, he said, is not about any common matter, but about being mad or not.
Marcus Aurelius, Meditations 11.38, translated by George Long
It is no casual matter, then, said he, that is at stake, but whether we are to be sane or no.
Marcus Aurelius, Meditations 11.38, translated by C. R. Haines