"Theologico-Political Treatise — Part 2" by Benedictus de Spinoza is a philosophical work published in 1670. Written in Latin and published anonymously, this controversial treatise challenges religious authority and defends freedom of thought. Spinoza critically examines the Bible and contemporary religion while arguing for the separation of church and state. He contends that democracy and freedom of speech work best when the state protects citizens' liberty while religious leaders stay out of politics. The work sparked immediate outrage and condemnation across Europe. (This is an automatically generated summary.)
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.