Listen to Blessed Assurance online. Blessed Assurance is an English language song and is sung by Leontyne Price, George Decker, Phoebe Knapp, Choir Of Men And Boys Of St. Thomas Episcopal Church, New York City and New York St. Thomas Choir of Men and Boys. Blessed Assurance, from the album A Heritage of Hymns - Classic Recordings of the Great Songs of Faith and Inspiration, was released in the year 2006. The duration of the song is 2:28. Download English songs online from JioSaavn.