In the early 17th century, authority came from scripture and classical sources. The Renaissance and Reformation looked to ancient Greeks and Romans, while the Bible was also seen as undisputed truth. The scientific revolution began to challenge assumptions, with figures like Descartes rejecting faith-based beliefs and Bacon advocating the scientific method. Enlightenment thinkers believed humans could use reason to understand nature through scientific laws, paving the way for legal and social reform based on principles of justice, efficiency and human rights.