Great Is Thy Faithfulness is a popular Christian hymn written by Thomas Chisholm (1866–1960) with music composed by William M. Runyan (1870–1957) in Baldwin City, Kansas, U.S.
The phrase "great is thy faithfulness" comes from the Old Testament Book of Lamentations 3:23.
These exact words occur in both the King James Bible and the Revised Standard Version.
Thomas O. Chisholm wrote the poem in 1923 about God's faithfulness over his lifetime.
Chisholm sent the song to William Runyan in Kansas, who was affiliated with both the Moody Bible Institute and Hope Publishing Company.