Final answer:
The Sibyls were prophetesses in ancient Greece and Rome who received divine messages and had the ability to see the future. They were believed to receive their visions from the gods or supernatural forces.
Step-by-step explanation:
The Sibyls were prophetesses in ancient Greece and Rome, believed to have the power to receive divine messages and see the future.
They were consulted for their visions and prophecies, which were seen as sacred knowledge.
The source of their visions is not specified in the question, but it is generally believed that the Sibyls received their visions from the gods or were inspired by supernatural forces.
For example, the Delphic Sibyl was associated with the Oracle of Delphi, where she would receive her visions and deliver prophecies.
The Libyan Sibyl was also known for her profound visions and was depicted by Michelangelo in the Sistine Chapel ceiling.