The German cardinal, mathematician, and philosopher whose Of Learned Ignorance applied Neoplatonic apophatic theology to a new account of the relation between finite mind and infinite God, whose conciliar diplomacy shaped the late medieval church, and whose speculative cosmology of the infinite universe anticipated Galileo and Bruno.
nicholas-cusa
German cardinal, mathematician, and philosopher (1401–1464) whose Of Learned Ignorance applied Neoplatonic apophatic theology to the limits of human knowledge of God, whose conciliar diplomacy between Council of Basel and the Greek union shaped the late medieval church, and whose cosmology of the centerless infinite universe anticipated Copernicus, Galileo, and Bruno.
Life
Nikolaus Cryfftz — latinized as Nicholas of Cusa after his birthplace, Kues (Cusa) on the Mosel river — was born in 1401 to a prosperous family of Mosel boatmen. The family fortune allowed an excellent education: schooling at the famous Brethren of the Common Life school at Deventer in the Netherlands (the same school that Erasmus would attend two generations later), then studies in arts and law at Heidelberg (1416–17), Padua (1417–23, where he took his doctorate in canon law), and theology at Cologne (from 1425).
The early career was as canon lawyer and diplomat in the service of the German archiepiscopal courts of Trier and Mainz. The major opportunity came with the Council of Basel, which opened in 1431 and which Nicholas attended from 1432 as canon of Liège and ecclesiastical lawyer. The Council was the great late medieval test case of conciliarism: the doctrine that a general council, representing the universal church, holds authority superior to the pope. Nicholas initially supported the conciliar position and composed his first major work, De Concordantia Catholica (1433), defending it on the basis of an elaborate political and ecclesiological theory.
The break with the Council came in 1437. When the Council and Pope Eugenius IV split over the venue for negotiations with the Greek Orthodox Church seeking union with Rome, Nicholas chose the papal side, becoming one of the negotiators who arranged the Greek embassy that would attend the Council of Ferrara-Florence (1438–39). His decisive role at Constantinople, where he persuaded the Greek emperor and patriarch to attend the Western council that produced the (short-lived) Union of Florence in July 1439, made his career.
The philosophical turn came on the sea voyage back from Constantinople in late 1437. By Nicholas's own account in the dedicatory letter prefixed to De Docta Ignorantia, the central conception of that work — the coincidence of opposites in the infinite, the apprehensible inapprehensibility of God — was "given from above" during the voyage, as he reflected on questions that had been with him for years. De Docta Ignorantia was published in 1440.
The ecclesiastical advancement followed. Nicholas was created cardinal in 1448 (the appointment was kept secret for several months for political reasons), appointed prince-bishop of Brixen (Bressanone, in the Tyrol) in 1450, and undertook two great visitation tours of German monasteries and dioceses (1451–52) commissioned by Pope Nicholas V to reform monastic discipline and revive the German church. He continued to write philosophical and theological works through the 1440s and 1450s — De Coniecturis, Apologia Doctae Ignorantiae, the dialogues of the Idiota group, De Pace Fidei (an irenic dialogue on religious peace composed in the wake of the Ottoman conquest of Constantinople in 1453), De Visione Dei, De Possest, the late De Apice Theoriae (1464).
The last years were dominated by his prolonged conflict with Archduke Sigismund of Austria over the temporal authority of the bishopric of Brixen — a conflict that included Sigismund's military attack on Nicholas at the castle of Bruneck in 1460 and Nicholas's flight to Rome. He died at Todi on 11 August 1464 while traveling on papal business, aged 63. His heart was buried at the hospital he had founded at Kues; the rest of his body lies in the Roman church of San Pietro in Vincoli, with a monument by Andrea Bregno.
On Learned Ignorance
De Docta Ignorantia (Of Learned Ignorance, 1440) is Nicholas's first major and most influential philosophical work. The three books develop, respectively, the divine reality, the universe as the contracted image of the divine reality, and Christ as the union of finite and infinite.
The central theme is announced in the title. Genuine knowledge of God is impossible because God is infinite and the human intellect finite; the proper response is not the despair of skepticism but the docta ignorantia — the learned ignorance that knows the limits of its own knowing. The infinite cannot be known by the finite intellect in the way finite things are known; it can be known only by the recognition that its mode of being exceeds all conceptual articulation.
This apophatic theology is developed through a series of mathematical metaphors that became characteristic of Cusan thought. In the infinite, opposites coincide: the maximum equals the minimum, since both lack a defining boundary; the line, the triangle, and the circle become identical when extended to infinity (an infinite line has no curvature and so is also a circle; an infinite triangle has equal sides at all distances and so is also a line, and so on). The coincidentia oppositorum — the coincidence of opposites — became Nicholas's most cited single doctrine.
The theological application: God is the absolute maximum, beyond all opposition of finite predicates. To speak truly of God we must say not merely that God is good (predicating a finite perfection of an infinite being) but that God is beyond the opposition of good and evil; not merely that God is being but beyond the opposition of being and non-being; not merely that God is one but beyond the opposition of one and many. The apophatic strain runs directly from Pseudo-Dionysius and Eriugena, to whom Nicholas was indebted at depth.
The cosmological application: the universe is a contracted maximum — the closest finite approximation to the divine infinity. Because no finite thing can be properly central to an infinite reality, the universe has no fixed center; the earth is not at the center of a closed Aristotelian cosmos but is one of many bodies in a cosmos that is in some sense infinite (Nicholas hedges on whether the universe is strictly infinite or only indefinite). This argument, three-quarters of a century before Copernicus and a century before Bruno, anticipates the cosmological transformation of the next two centuries.
Jasper Hopkins's translations (which now include the entire Cusan corpus, available freely online and in Hopkins's three-volume Complete Philosophical and Theological Treatises) are the standard English access. The Heidelberg Academy critical edition (Nicolai de Cusa Opera Omnia, in progress since 1932) is the standard scholarly Latin text.
Subsequent Works
The later writings develop themes from De Docta Ignorantia. De Coniecturis (On Surmises, c. 1442) develops the epistemological consequences — if all human knowledge is at best a coniectura (a probable approximation), then the mathematical-symbolic mode of approach to the divine that Nicholas favored is appropriate. De Visione Dei (On the Vision of God, 1453), written for the Tegernsee monks, develops the experiential side: a meditation on the omnivoyant icon of Christ that Nicholas had sent to the monastery, by which each viewer feels Christ's gaze fixed on him personally though the image is one, allowing reflection on how the infinite God relates to each finite creature.
The Idiota dialogues (On Wisdom, On the Mind, On Experiments with Weights, 1450) present an unlearned man of practical wisdom — the idiota, in the technical sense of one not formally educated — explaining philosophical insights to a humanist orator and a Scholastic philosopher. The form allowed Nicholas to develop his thought outside the academic apparatus and to advance experimental themes (the weights dialogue includes proto-empirical reflection on hydrostatic measurement).
De Pace Fidei (On the Peace of Faith, 1453), composed in the months after the Ottoman conquest of Constantinople, presents a fictional council in heaven in which representatives of the major world religions — Greek, Italian, Arab, Indian, Chaldean, Jew, Scythian, Persian, Syrian, Turk, Spaniard, German, Tatar, Armenian, Bohemian, Englishman — reach agreement on essential doctrines beneath the diversity of rites. The work is one of the earliest sustained Christian arguments for the possibility of interreligious peace through the recognition of a common core of revealed truth.
Mathematics and Natural Philosophy
Nicholas's mathematical writings address the quadrature of the circle (a problem he believed soluble and to which he returned repeatedly), the foundations of arithmetic, and the relation of mathematical to theological knowledge. His De Arithmeticis Complementis and other short works place him among the more original mathematical thinkers of the early fifteenth century, though his mathematical results have not stood up to subsequent scrutiny (the circle is not in fact constructible by ruler and compass, as Lindemann's 1882 proof of the transcendence of π established).
The astronomical positions in De Docta Ignorantia and elsewhere — the earth's mobility, the absence of a fixed center of the universe, the corruption of celestial bodies just as of terrestrial — anticipate the heliocentric astronomy of Copernicus, Kepler, and Galileo, though Nicholas's grounds were theological-philosophical rather than astronomical. Hans Blumenberg's The Genesis of the Copernican World (Suhrkamp, 1975) treats Nicholas at length as a critical antecedent to the early modern cosmological revolution.
Reception
Nicholas was acknowledged as a major figure in his own lifetime but his reception was relatively modest in the century after his death. The Florentine Platonists — Marsilio Ficino, Pico della Mirandola — read him with appreciation, finding in his Neoplatonic Christianity a model for their own integration of Platonism with Christian theology. Lefèvre d'Étaples edited Nicholas's works in Paris (3 vols., 1514) and helped transmit his thought to the early Reformation generation.
Giordano Bruno (d. 1600) drew on Nicholas's cosmological themes extensively in developing the infinite-universes cosmology of De l'infinito universo e mondi (1584), often without attribution. Spinoza and Leibniz both read Cusan material, though the depth of influence is contested; the Leibnizian conception of the vinculum substantiale and of monadic perspective on the infinite has Cusan resonances.
The nineteenth-century German philosophical recovery was significant. Schelling, Hegel, and the broader German speculative tradition treated Nicholas as a critical bridge between medieval Neoplatonism and modern speculative philosophy. The major twentieth-century interpretive works — Karl Jaspers's Nikolaus Cusanus (Piper, 1964), Ernst Cassirer's treatment in The Individual and the Cosmos in Renaissance Philosophy (1927), Werner Beierwaltes's Identität und Differenz (1980), Hans Blumenberg's work — established Nicholas as a major figure in the history of European thought. The American Cusanus Society and the German Cusanus-Gesellschaft maintain continuous scholarly attention.
Significance
Nicholas's importance has three dimensions. Philosophically, he was the most original Christian Neoplatonist between Eriugena and the German Idealists — a speculative theologian whose docta ignorantia and coincidentia oppositorum extended the apophatic tradition while integrating it with mathematical metaphor in genuinely new ways. Cosmologically, his rejection of the closed Aristotelian universe and affirmation of a centerless universe without fixed boundaries anticipated and helped enable the early modern cosmological transformation. Ecclesiastically, his conciliar work — first defending and then qualifying the conciliar position, his role in the Greek union, his German diocesan reform — placed him at the center of the late medieval church's effort to reform itself before the breakdown of the sixteenth century. He stands at the meeting point of medieval and modern thought.