Answer: Because of Aristotle's system of reasoning as the opposite of medieval dogma.
Explanation: Aristotle is one of the greatest and most important philosophers of ancient Greece. His significance is not reflected solely by his contribution to scientific disciplines such as mathematics, physics, logic, metaphysics, ethics, politics, but also by his influence during the revival of the Greek philosopher at the time of the Renaissance. At the time of the revival of humanism, naturalism, taken from ancient Greece, Aristotle's philosophy and logic was exactly the opposite from what was the dogmatic doctrine of medieval Christians. Aristotle as the first who developed a formalized system for reasoning and his teaching was an excellent basis for the development of the Renaissance, based on natural science, humanism and reasoning.