Translator Credit
Naming the translator, because a quotation in translation is also that translator's wording.
A translator credit names the person whose English you are actually quoting. When you cite a line from Rilke or Basho or Marcus Aurelius in English, the diction, rhythm, and word choice belong to a translator; the author supplied the sense. Style guides therefore treat the translator as a named contributor: 'trans. Gregory Hays' in Chicago, 'Translated by Gregory Hays' in MLA.
The practical consequence for quotation is large. Different translations of the same passage produce different famous lines, and readers who compare them often find they have been quoting a translator's invention. Meditations is the standard demonstration: the Hays, Farquharson, and Long versions of the same paragraph diverge enough that a memorable phrase in one may be absent from another.
Where you have translated a passage yourself, say so — 'my translation' or 'translation mine' in a note. Where a translation is out of copyright and you have modernised it, that too is a change readers are entitled to know about.
Common mistake: quoting an unnamed translation found online. Anonymous internet translations of classical texts are frequently loose paraphrases, and they are a major source of quotations that no scholarly edition can confirm.
“You have power over your mind — not outside events. Realize this, and you will find strength.”
Keep reading the glossary
How faithfully a translated quote preserves the meaning and music of the original.
A formal reference that lets a reader locate the source of a quote.
Word-for-word — quoting exactly as the original was spoken or written.
Reproducing a quote with the wording changed — even if the source is correct.