Cryptoquote XIII
This challenge contains a cryptoquote puzzle.
In this quotation, one letter has been substituted for another. Can you break the code? The text area is for you to work out the solution. Seneca the Younger said it about goodness in his Epistulae Morales, 22. Clue: G = W

MO ME SXO DXXKSAEE OX NA
NAOOAP OLYS OLA GXPEO.

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