On the threshold of a new era, the Renaissance, a thinker emerged who continues to astonish us to this day: Nicholas of Cusa (1401-1464), cardinal, papal diplomat, pioneer in dialogue with Islam, and above all, a great philosopher. He was the first to dare to think that the universe is infinite. His bold thesis of the "coincidence of opposites" became a major source of inspiration for Western philosophy. Josef Gelmi masterfully introduces us to the life and thought of Cusanus.