Answer: Abstract reasoning and experimentation could explain nature.
Both Francis Bacon and Renee Descartes shared a belief that abstract reasoning and experimentation could explain nature. Abstract reasoning is one of the most important elements of the Enlightenment. This movement encouraged individuals to engage in careful reasoning when studying the world. The importance of reasoning is exemplified in Descartes's maxim: "I think, therefore, I am."
Experimentation was an important element of the Scientific Revolution. Both thinkers encouraged people to believe concrete evidence, as opposed to prejudice, ideologies, or religious doctrine. Experimentation was considered the best way to acquire evidence about the world.