In the half century since its first publication in English, this small book has become a classic of medieval theology. Directing his attention to 'perhaps the most neglected aspect' of Cistercian mysticism, the great French medievalist and philosopher Etienne Gilson directs attention to 'that part of Bernard's] theology on which his mysticism rests', his 'systematics'. Cistercian Publications brings this important book back into print in celebration of the nine-hundredth anniversary of the birth of Saint Bernard, hoping that new generations of scholars will find it food for thought and further research.