Nicholas of Cusa

Nicholas of Cusa was a remarkable German polymath of the 15th century. A polymath is a person who has deep knowledge in many different fields. He was a Catholic bishop, a philosopher, a theologian, and a jurist. He also worked as a mathematician and an astronomer.

Born in Kues, Germany, in 1401, he was the son of Johan Krebs. His father was a successful ferryman and boat owner. Nicholas became one of the first German supporters of Renaissance humanism. This movement emphasized the importance of human potential and classical learning.

Nicholas studied many subjects at several different universities. He entered the Faculty of Arts at Heidelberg University in 1416. Later, he earned a doctorate in canon law from the University of Padua in 1423. In Padua, he met important figures like the mathematician Paolo dal Pozzo Toscanelli. He also taught and practiced law at the University of Cologne. Throughout his life, he became an expert in researching ancient manuscripts. He used textual criticism to examine primary sources very carefully. In 1433, he even proved that the Donation of Constantine was a fake document.

His philosophical work is centered on a concept called "learned ignorance." This idea is found in his treatise, *De Docta Ignorantia*. He argued that the finite human mind cannot fully understand the infinite mind of God. He called this infinite being "the Maximum." Even though we cannot know everything, he believed we can grow by recognizing our own limitations. This process of knowing what we do not know is what he called "learned ignorance." He also used the idea of "conjectures" to help people reach a better understanding of truth.

In the field of science, Nicholas held views that were very advanced. He believed the Earth was a star like any other star in the sky. He argued that the Earth was not the center of the universe. He also suggested that the Earth was not at rest. He believed the celestial bodies were not perfectly spherical and their orbits were not circular. He even wrote about the possibility that there were many different worlds. His ideas were based on abstract speculation and the symbolism of numbers. Some historians believe his thoughts might have encouraged Copernicus later on.

Nicholas also made important contributions to mathematics and medicine. He used mathematical figures to help the mind prepare for the "coincidence of opposites." He even wrote about the difficult problem of squaring the circle. In medicine, he introduced a new way to measure a person's pulse. Before him, doctors would feel the pulse but rarely count it. He suggested using a water clock to measure how much water ran out during one hundred beats. This helped doctors observe the heart rate more accurately. This method was a useful improvement for clinical medicine.

As a political figure, Nicholas served as a diplomat and a papal legate. He was appointed a cardinal by Pope Nicholas V in 1448. He also served as the Prince-Bishop of Brixen. During his "Great Legation," he traveled almost 3,000 miles to preach and reform. He was known as the "Hercules of the Eugenian cause" for his work. In politics, he proposed a specific method for electing Holy Roman Emperors. This method was very similar to the Borda count used in modern elections. His mathematical approach to voting preceded the actual Borda count by over 300 years.

Nicholas faced many challenges during his career. He was involved in power struggles between Rome and the German states. In 1460, Duke Sigismund of Austria imprisoned him. This led Pope Pius II to excommunicate the Duke. Nicholas eventually returned to Rome but could not return to his bishopric. He died in Todi, Italy, on 11 August 1464. His body was buried in the church of San Pietro in Vincoli in Rome.

He left his entire inheritance to the Cusanusstift, a home for the aged in his hometown. This institution still serves its original purpose today.