Nicholas of Cusa, also referred to as Nicholas of Kues and Nicolaus Cusanus, was a German Catholic cardinal and polymath active as a philosopher, theologian, jurist, mathematician and astronomer. One of the first German proponents of Renaissance humanism, he made spiritual and political contributions in European history. A notable example of this is his mystical or spiritual writings on "learned ignorance," as well as his participation in power struggles between Rome and the German states of the...