
Original: «The soul is placed in the body like a rough diamond, and must be polished, or the luster of it will never appear».
Fuente: The Oxford Dictionary of Quotations. Autores Oxford University Press, TME. Editores Elizabeth M. Knowles, Angela Partington. Colaboradora Elizabeth M. Knowles. Edición revisada. Editorial Oxford University Press, 1999. ISBN 9780198601739, p. 254. https://books.google.es/books?id=o6rFno1ffQoC&pg=PP274&dq=The+soul+is+placed+in+the+body+like+a+rough+diamond,+and+must+be+polished,+or+the+luster+of+it+will+never+appear&hl=es&sa=X&ved=0ahUKEwiJq_-JwqfgAhXjA2MBHYGsAogQ6AEIKDAA#v=onepage&q=The%20soul%20is%20placed%20in%20the%20body%20like%20a%20rough%20diamond%2C%20and%20must%20be%20polished%2C%20or%20the%20luster%20of%20it%20will%20never%20appear&f=false