Before you act, ask: will I regret this?

The source

"Before you act, ask: will I regret this?" Marcus Aurelius said it in Meditations 8.2. Translated by George Long, 1862.

"On the occasion of every act ask thyself ... Shall I repent of it?"

George Long, 1862, Meditations 8.2.

Who said it

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

Questions

Who said "Before you act, ask: will I regret this?"?

Marcus Aurelius (121–180 AD). Source: Meditations 8.2.

What is the original wording?

On the occasion of every act ask thyself ... Shall I repent of it? (George Long, 1862). Translated by George Long, 1862.