Final answer:
Isabel Allende, a South American writer, said the quote 'Simple things are the most valuable and only wise people appreciate them.'
Step-by-step explanation:
The South American writer who said the quote, 'Simple things are the most valuable and only wise people appreciate them,' is Isabel Allende. She is a well-known Chilean author recognized for her novels, such as 'The House of the Spirits' and 'Eva Luna,' which often explore themes of love, family, and human connection.
Learn more about Isabel Allende