“Man is essentially ignorant, and becomes learned through acquiring knowledge.”
Portrait of Ibn Khaldun.
His book, Al Muqaddimah is a work of genius that changed the world, if I were to list the most importrant books ever written, I’d put Al Muqaddimah second, right after Philosophiæ Naturalis Principia Mathematica.
This man taught the world to not take history as it is but to investigate through other sources and apply logic to it and only then, accept a story as fact. Essentially, he was the first man to bring the study of history into the circle that held other disciplines of extreme importance such as physics.