In these conferences dating to 1961, Thomas Merton provides for his audience of young monks an overview of major themes and figures in the Christian mystical tradition as an integral part of their religious inheritance and a crucial part of their spiritual formation. From Fathers of the Church such as St Athanasius and St Gregory of Nyssa, through such important medieval theologians as St Bonaventure, Hadewijch and Meister Eckhart, to the great Spanish Carmelites St Teresa of Avila and St John of the Cross, Merton traces such key topics as the integration of theology and spirituality; the importance of natural contemplation -recognizing the divine presence in creation; the centrality of apophatic or dark contemplation; and the role of spiritual direction in forming mature and balanced contemplatives.