Harry Boosalis compiles a systemtatic study of the teachings of St Silouan the Athonite (1866-1938) and reveals the relevance of Silouan's spritual instruction for contemporary Christians. Drawing parallels with patristic teachings and highlighting patristic sources, Boosalis demonstrates Silouan's traditional roots while revealing several novel insights of the saint. Special attention is devoted to the acquisition of the grace of the Holy Spirit, spiritual warfare, the significance of suffering, humility, love for all mankind and prayer for the salvation of the whole of creation.