Cryptoquote II

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 said it about boldness. Clue: S = W FA FE IMA PORYNEO ADFIVE YXO GFTTFRNBA ADYA SO GM IMA GYXO; FA FE PORYNEO SO GM IMA GYXO ADYA ADFIVE YXO GFTTFRNBA.

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