" Also, there was a disciple of Plato who one time spoke to his Master, as the book by Senior Zadith will bear witness, and this was his demand, in all truthfulness: “Tell me the name of the Philosopher’s Stone.” And Plato answered unto him anon, “It is the stone that men call Titanos.” “What is that?” asked the disciple. “It is the same as Magnasia,” said Plato. “Yea, Sir, and is it thus?” said the disciple. “This is to explain one unknown by another unknown. What is Magnasia, good Sir? Pray tell me.” “It is a liquid that is made of four elements,” said Plato. “Tell me the source of that liquid, good Sir, if it be your will,” said the disciple. “Nay, nay,” said Plato, “that I certainly shall not. "

― Geoffrey Chaucer , The Canterbury Tales