His account of the rivalry between Peter Abelard and Bernard of Clairvaux is masterful, nor does he fail to give John of Salisbury the space he deserves." "The account is broken by the gradual replacement of the synthesis of faith and reason that had been achieved in the early Middle Ages by a new one that made use of Aristotle. Pieper gives a thorough and lively account of the struggle between Aristotelains and anti-Aristotelians, and the famous condemnations that put the effort of Saint Thomas Aquinas at risk. But the Summa theologiae is regarded by Pieper as the unique achievement of the period." "If the early centuries, the medieval period, can be seen as moving toward the thirteenth and Thomas's unique achievement, subsequent centuries saw the decline of scholasticism and the appearance of harbingers of modern philosophy.".