The Schoolmen of the Middle Ages often discussed such subjects as these: whether the finite can comprehend the infinite at any point, since the infinite can have no finite points; whether God can make a wheel revolve and be stationary at the same time; whether all children in a state of innocence are masculine. Such debates made remarkable theologians and metaphysicians, developed precision in defining terms, accuracy in applying the rules of deductive logic, and fluency in expression. As a result, later scientists were able to reason more accurately and express themselves with greater facility. The chief fault of the studies of the Middle Ages consisted in neglecting the external world of concrete fact. The discussions of the Schoolmen would never have introduced printing or invented the mariner's compass or developed any of the sciences that have revolutionized life. The coming of the Renaissance opened avenues of learning outside of the church, interested men in manifold questions relating to this world, caused a demand for scientific investigation and proof, and made increasing numbers seek for joy in this life as well as in that to come. Causes and Effects of the Renaissance.--Some of the causes of this new movement were the weariness of human beings with their lack of progress, their dissatisfaction with the low estimate of the value of this life, and their yearning for fuller expansion of the soul, for more knowledge and joy on this side of the grave. Another cause was the influence of Greek literature newly discovered in the fifteenth century by the western world. In 1423 an Italian scholar brought 238 Greek manuscripts to Italy. In 1453 the Turks captured Constantinople, the capital of the Eastern Roman Empire and the headquarters of Grecian learning. Because of the remoteness of this capital, English literature had not been greatly influenced by Greece. When Constantinople fell, many of her scholars went to Italy, taking with them precious Grecian manuscripts. As Englishmen often visited Italy, they soon began to study Grecian masterpieces, and to fall under the spell of Homer and the Athenian dramatists. The renewed study of Greek and Latin classics stimulated a longing for the beautiful in art and literature. Fourteenth-century Italian writers, like Petrarch and Boccaccio, found increasing interest in their work. Sixteenth-century artists, such as Leonardo da Vinci, Michael Angelo, and Raphael show their magnificent response to a world that had already been born again. Many of the other so-called causes of the Renaissance should strictly be considered its effects. The application of the modern theory of the solar system, the desire for exploration, the use of the mariner's compass, the invention and spread of printing, were more effects of the new movement than its causes.