The Golden Age of Spanish Spiritual Theology flowered suddenly, almost as though a summer were to burst upon us without a springtide. Not that Spaniards were ignorant of the subject, either in theory or in practice, but previous to the middle of the fifteenth century they produced scarcely any native writers. The medieval period proper was one of importation and imitation. Works of foreign authorship were translated, and Spain was long content to draw upon the common heritage of Western Christendom, for her mystical as for her dogmatic theology. Then, roughly half-way through the century, there begins a long line of Spanish writers who have assimilated the masterpieces of other lands, whether in the original or in translation, and are becoming increasingly original until we reach peak point with St Teresa and St John of the Cross.