Which author/philosopher wrote "Saper aude"? Immanuel Kant John Locke Voltaire Jonathan Swift

The correct answer is Immanuel Kant.

The phrase was first used by the Roman poet Horace but it became associated with the Age of Enlightenment who used in his essay "Answering the Question: What Is Enlightenment? from 1784. The phrase means "dare to know" and it was often used as a motto. With this phrase Kant urged people be liberate themselves intellectually.