Written between the 4th and 15th centuries by spiritual masters of the Orthodox Christian tradition, the texts published in Greek in 1782 as "The Philokalia" were later translated into Slavonic and then Russian. This is the fourth of five volumes of a translation from the original Greek, and contains some of the most important writings in the entire collection. St Symeon the New Theologian speaks about the conscious experience of the Holy Spirit and about the vision of the divine and uncreated Light; St Gregory of Sinai provides practical guidance concerning the life of the Hesychast and the use of the Jesus Prayer; and St Gregory Palamas discusses the distinction - often misunderstood - between the essence and the energies of God.