The Psalmist wrote: "Be still and know that I am God" (Ps 46:10). Coming from the deep silence and asceticism of medi val Carthusian monasteries, this book's prayers and meditations have a unique ardour that reflects the genuine spirituality of their authors. The piety of these monks, strongly grounded in Sacred Scripture and the early Fathers of the Church, cannot fail to impress and to inspire. Like that of Jesus, Carthusian prayer, but also any authentic prayer, is anchored in interiority, solitude and silence. Jesus goes off to a deserted place, under the sole gaze of the Father. And in this solitude and this silence, He formed His disciples.