Who said "Not right? Don't do it. Not true? Don't say it."?

Marcus Aurelius (121–180 AD). Source: Meditations 12.17.

What is the original wording?

If it is not right, do not do it: if it is not true, do not say it (George Long, 1862). Translated by George Long, 1862.

Yes. It is printed on our tees, from $46, with free US shipping.

Marcus Aurelius, Meditations 12.17

"Not right? Don't do it. Not true? Don't say it." Marcus Aurelius said it in Meditations 12.17. Translated by George Long, 1862.

"If it is not right, do not do it: if it is not true, do not say it"

George Long, 1862, Meditations 12.17.

Marcus Aurelius (121–180 AD). Roman emperor who wrote private notes to himself on a military campaign. We know them as the Meditations.

Who said "Not right? Don't do it. Not true? Don't say it."?: Marcus Aurelius (121–180 AD). Source: Meditations 12.17.
What is the original wording?: If it is not right, do not do it: if it is not true, do not say it (George Long, 1862). Translated by George Long, 1862.
Is "Not right? Don't do it. Not true? Don't say it." on a shirt?: Yes. It is printed on our tees, from $46, with free US shipping.