Angelus Silesius:  pseudonym of Johannes Scheffler (December 25, 1624 – July 9, 1677).  Born in Breslau, Silesia (now Poland) he was brought up Luthern but joined the Roman Catholic Church in 1652.  He was court physician to the Habsburgs and in 1661 became a priest.  His thinking and writing developed into Christian mysticism.  He wrote many hymns but is most remembered for his collection of aphorisms, Der Cherubinische Wandersmann (The Cherubic Pilgrim).