Final answer:
Galileo's statement indicates that anyone can challenge a scientific theory, even if it is popular.
Step-by-step explanation:
Galileo's statement indicates that anyone can use data to challenge a scientific theory, even if that theory is highly popular. He believed that the authority of a thousand is not worth the humble reasoning of a single individual when it comes to questions of science. Galileo himself challenged the popular belief that the Earth was the center of creation and supported the Copernican hypothesis of a heliocentric solar system.