Probably the widest field is still in the purification of iron and steel.
After purification he was sent by the Pythia to serve Eurystheus.
Besides these extraction and purification processes there are those of adjustment and shaping.
As such a novum salutis genus, the Crusades connect themselves with the history of the penitentiary system; as the foreign policy of the Church they belong to that clerical purification and direction of feudal society and its instincts, which appears in the institution of "God's Truce" and in chivalry itself.
The Jew and the heathen had the gospel preached to them in the world below by Christ and his apostles, and Christians will have to pass through processes of purification and trial after death before they reach knowledge and perfect bliss.