The existence of so many opposing systems of philosophy caused men to doubt the truth of any of them. Many thoughtful minds were hopelessly asking, "What is truth?"
Pyrrho (about 360–270 B.C.) was the doubting Thomas of the Greeks. He questioned everything, and declared that the great problems of the universe could not be solved. He asserted that it was the duty of man, and the part of wisdom, to entertain no positive judgment on any matter, and thus to ensure serenity and peace of mind.
The disciples of Pyrrho went to absurd lengths in their skepticism, some of them even saying that they asserted nothing, not even that they asserted nothing. They doubted whether they doubted.
The Neo-Platonists.—Neo-Platonism was a blending of Greek philosophy and Oriental mysticism. It has been well called the "despair of reason," because it abandoned all hope of man's ever being able to attain the highest knowledge through reason alone, and looked for a Revelation. The centre of this last movement in Greek philosophical thought was Alexandria in Egypt, the meeting-place, in the closing centuries of the ancient world, of the East and the West.
Philo the Jew (b. about 30 B.C.), who labored to harmonize Hebrew doctrines with the teachings of Plato, was the forerunner of the Neo-Platonists. But the greatest of the school was Plotinus (A.D. 204–269), who spent the last years of his life at Rome, where he was a great favorite.
Conflict between Neo-Platonism and Christianity.—While the Neo-Platonists were laboring to restore, in modified form, the ancient Greek philosophy and worship, the teachers of Christianity were fast winning the world over to a new faith. The two systems came into deadly antagonism. Christianity triumphed. The gifted and beautiful Hypatia. almost the last representative of the old system of speculation and belief, was torn to pieces in the streets of Alexandria by a mob of fanatic Christian monks (A.D. 415). Finally the Roman emperor Justinian forbade the pagan
