1. The Christian Idea.—The Grecian intellectual life at the time of its fairest bloom, was characterized by the immediate sacrifice of the subject to the object (nature, the state, &c.): the full breach between the two, between spirit and nature, had not yet arrived; the subject had not yet so far reflected upon himself that he could apprehend his own absolute worth. This breach came in, with the decay of Grecian life, in the time after Alexander the Great. As the objective world lost its influence, the thinking consciousness turned back upon itself; but even in this very process, the bridge between subject and object was broken down. The self-consciousness had not yet become sufficiently absorbed in itself to look upon the true, the divine, in any other light than as separate from itself, and belonging to an opposite world; while a feeling of pain, of unsatisfied desire, took the place of that fair unity between spirit and nature which had been peculiar to the better periods of the Grecian civil and artistic life. New Platonism, by its overleaping speculation, and, practically, by its mortification of the sense, made a last and despairing attempt to overcome this separation, or to bury itself within it, by bringing the two sides forcibly together. The attempt was in vain, and the old philosophy, totally exhausted, came to its end. Dualism is therefore the rock on which it split. This problem, thus left without a solution, Christianity took up. It assumed for its principle the idea which the ancient thinking had not known how to carry out, affirming that the separation between God and man might be overcome, and that the human and the divine could be united in one. The speculative fundamental idea of Christianity is, that God has become incarnate, and this had its practical exhibition (for Christianity was a practical religion) in the idea of the atonement and the demand of the new birth, i. e. the positive purifying of the sense from its corruptions, instead of holding it, as asceticism, in a merely negative relation.

From the introduction of Christianity, monism has been the character and the fundamental tendency of the whole modern philosophy. In fact, the new philosophy started from the very point at which the old had stood still. The turning of the self-consciousness upon itself, which was the standpoint of the post-Aristotelian speculations, forms in Descartes the starting-point of the new philosophy, whose whole course has been the reconciling of that opposition beyond which the old could not pass.

2. Scholasticism.—It very early resulted that Christianity came in contact with the cotemporaneous philosophy, especially with Platonism. This arose first with the apologists of the second century, and the fathers of the Alexandrian church. Subsequently, in the ninth century, Scotus Erigena made an attempt to combine Christianity with New Platonism, though it was not till the second half of the Middle Ages, from the eleventh century, that there was developed any thing that might be properly termed a Christian philosophy. This was the so-called Scholasticism.

The effort of Scholasticism was to mediate between the dogma of religion and the reflecting self-consciousness; to reconcile faith and knowledge. When the dogma passed over into the schools from the Church which had given it utterance, and theology became a science of the universities, the scientific interest asserted its rights, and undertook to bring the dogma which had hitherto stood over against the self-consciousness as an external power, into a closer relation to the thinking subject. A series of attempts was now made to bring out the doctrines of the Church in the form of scientific systems (the first complete dogmatic system was given by Peter Lombard, who died 1164, in his four books of sentences, and was voluminously commented upon by the later Scholastics), all starting from the indisputable premise (beyond which scholastic thinking never reached), that the faith of the church is absolute truth; but all guided likewise by the interest to make this revealed truth intelligible, and to show it to be rational. “Credo ut intelligam”—this expression of Anselm, the beginner and founder of Scholasticism (he was born about 1034, and made Archbishop of Canterbury in 1093), was the watchword of this whole direction. Scholasticism applied to the solution of its problem the most remarkable logical acumen, and brought out systems of doctrine like the Gothic cathedrals in their architecture. The extended study of Aristotle, called par eminence “the philosopher,” whom many of the most distinguished Scholastics wrote commentaries upon, and who was greatly studied at the same period among the Arabians (Avicenna and Averroes), furnished their terminology and most of their points of view. At the summit of Scholasticism we must place the two incontestably greatest masters of the Scholastic art and method, Thomas Aquinas (Dominican, who died 1274) and Duns Scotus (Franciscan, who died 1308), the founders of two schools, in which since their time the whole Scholastic theology divides itself—the former exalting the understanding (intellectus), and the latter the will (voluntas), as their highest principle, both being driven into essentially differing directions by this opposition of a theoretical and a practical principle. Even with this began the downfall of Scholasticism; its highest point was also the turning-point to its self-destruction. The rationality of the dogma, the oneness of faith and knowledge, had been constantly their fundamental premise; but this premise fell away, and the whole basis of their metaphysics was given up in principle, the moment Duns Scotus placed the problem of theology in the practical. When the practical and the theoretical became divided, and still more when thought and being were separated by Nominalism (cf. 3), philosophy broke loose from theology and knowledge from faith; knowledge assumed its position above faith and above authority (modern philosophy), and the religious consciousness broke with the traditional dogma (the Reformation).

3. Nominalism and Realism.—Hand in hand with the whole development of Scholasticism, there was developed the opposition between Nominalism and Realism, an opposition whose origin is to be found in the relation of Scholasticism to the Platonic and Aristotelian philosophy. The Nominalists were those who held that the conceptions of the universal (the universalia) were simple names, flatus vocis, representations without content and without reality. According to them there are no universal conceptions, no species, no class; every thing which is, exists only as separate in its pure individuality; there is, therefore, no pure thinking, but only a representation and sensuous perception. The Realists, on the other hand, taking pattern from Plato, held fast to the objective reality of the universals (universalia ante rem). These opposite directions appeared first between Roscellinus, who took the side of Nominalism, and Anselm, who advocated the Realistic theory, and it is seen from this time through the whole period of Scholasticism, though from the age of Abelard (born 1079) a middle view, which was both Nominalistic and Realistic, held with some slight modifications the prominent place (universalia in re). According to this view the universal is only something thought and represented, though as such it is not simply a product of the representing consciousness, but has also its objective reality in objects themselves, from which it was argued we could not abstract it if it were not essentially contained in them. This identity of thought and being, is the fundamental premise on which the whole dialectic course of the Scholastics rests. All their arguments are founded on the claim, that that which has been syllogistically proved is in reality the same as in logical thinking. If this premise is overthrown, so falls with it the whole basis of Scholasticism; and there remains nothing more for the thinker to do, who has gone astray in his objectivity, but to fall back upon himself. This self-dissolution of Scholasticism actually appears with William of Occam (died 1347), the most influential reviver of that Nominalism which had been so mighty in the beginning of Scholasticism, but which now, more victorious against a decaying than then against a rising form of culture, plucked away its foundation from the framework of Scholastic dogmatism, and brought the whole structure into inevitable ruin.