Adolph Saphir (1831 - 1891) was a Hungarian Christian who was born into a Jewish family. He and his family were converted in 1843 when the Scottish Free Church sent missionaries to the Jews in Hungary. After completing his studies in
1854, Saphir served in the Irish Presbyterian Church as a missionary to the Jews. He was later ordained by the Presbytery of Belfast. He was a pastor of churches in Glasgow and in London from 1861-1888. Saphir's book,
The Hidden Life was described as "one of the most helpful books in English literature on the subject of prayer and the deeper Christian life." ^^
http://www2.biola.edu/kingsbusiness/view/page/?issue=4&volume=3&page=21 See number 4.