"Blessed Assurance, Jesus is Mine" was written by the prolific American hymn writer Fanny Crosby in 1873. Crosby was a woman who wrote under at least 46 different pseudonyms. The tune is 'Blessed Assurance', written by Phoebe Knapp in 1873. She played the tune to her friend Fanny Crosy and asked her what she thought of it. 'Blessed Assurance' was Crosby's immediate reply. This performance is by the Celebration Choir. Video background from Pixabay.