Marcus Tullius Cicero (106 BC – 43 BC)

As a skeptic, Cicero states that there is no true philosophy due to the fact that Man can never be certain in his knowledge about reality. As a stoic humanist, he believes there is a natural law stemming from universal reason. Since human beings share both the natural law and reason, Man’s actions are only partially predetermined while he enjoys free will quite to a significant extent.

Modern Reflection  

Cicero’s eclectic approach to philosophy mirrors modern attempts to synthesize insights from multiple disciplines rather than commit to a single system. His use of Academic Skepticism to guide ethical and political judgment anticipates contemporary debates about how to act responsibly when knowledge is uncertain. Although he was not a systematic philosopher, his reflections on duty, probability, and public life remain relevant in an age shaped by complex information and competing values. He suggests that freedom involves navigating uncertainty with prudence rather than waiting for perfect clarity.

Carneades (214 BC – 129 BC)

An atheist and a radical skeptic, Carneades is the first to claim that metaphysicians have failed to identify rational meanings in religious beliefs. Neither senses nor reason can allow people to acquire truth: all knowledge is impossible, except for the knowledge that all other knowledge is impossible. People manage to live and act correctly by means of probabilities of truth, the only ones that can be determined. The world is the result of chance, but human beings can freely choose what to do due to their “free movement of mind” and the ability to be the cause of their own actions.

Modern Reflection  

Carneades’s insistence that certainty is unattainable anticipates modern discussions about probabilistic reasoning, cognitive bias, and the limits of human knowledge. His idea that we must act on the most persuasive evidence rather than absolute truth resembles contemporary approaches in science, law, and everyday decision‑making. While his skepticism can seem destabilizing, it also encourages intellectual humility and flexibility in the face of incomplete information. He offers a model of freedom grounded not in certainty but in the responsible management of doubt.