Is this sentence correct. Should I change "is" on "was" ?
I am writing an essay
Aristotle said that “Friendship is a single soul dwelling in two bodies”.
Aristotle said, “Friendship is a single soul dwelling in two bodies”. " (direct quotion, American English punctuation) Aristotle said that friendship is a single soul dwelling in two bodies. (reported speech) Format frequently used in essays: Friendship is a single soul dwelling in two bodies.
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Aristotle said, “Friendship is a single soul dwelling in two bodies”. (direct quotation, British English punctuation)
Aristotle said, “Friendship is a single soul dwelling in two bodies." (direct quotion, American English punctuation)
Aristotle said that friendship is a single soul dwelling in two bodies. (reported speech)
Format frequently used in essays: