The Alchemist by H.P. Lovecraft

Can you not guess my secret? Have you no brain whereby you may recognize the will which has through six long centuries fulfilled the dreadful curse upon your house? Have I not told you of the great elixir of eternal life? Know you not how the secret of Alchemy was solved? I tell you, it is I! I! I, that have lived for six hundred years to maintain my revenge, for I am Charles Le Sorcier!