Aristotle: Be a free thinker
Be a free thinker and don't accept everything you hear as truth.
Be critical and evaluate what you believe in.
Aristotle (Stageira, 384 BC - Chalkis, 322 BC) was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology. Together with Plato and Socrates (Plato's teacher), Aristotle is one of the most important founding figures in Western philosophy. The writings of Aristotle were the first to create a comprehensive system of Western philosophy, encompassing ethics, aesthetics, logic, science, politics, and metaphysics.