Meditations 1.10

From Alexander the grammarian, to refrain from fault-finding, and not in a reproachful way to chide those who uttered any barbarous or solecistic or strange-sounding expression; but dexterously to introduce the very expression which ought to have been used, and in the way of answer or giving confirmation, or joining in an inquiry about the thing itself, not about the word, or by some other fit suggestion.

Marcus Aurelius, Meditations 1.10, translated by George Long

From Alexander the Grammarian, not to be captious; nor in a carping spirit find fault with those who import into their conversation any expression which is barbarous or ungrammatical or mispronounced, but tactfully to bring in the very expression, that ought to have been used, by way of answer, or as it were in joint support of the assertion, or as a joint consideration of the thing itself and not of the language, or by some such graceful reminder.

Marcus Aurelius, Meditations 1.10, translated by C. R. Haines