The Story Behind 'Blessed Assurance'

The story behind Blessed Assurance is really the story of a friendship and a question. One day in 1873, Phoebe Knapp sat down at her organ, played a tune she had just written, and asked her friend Fanny Crosby, "What does this tune say to you?" Crosby — blind since infancy — answered without hesitation: "Blessed assurance, Jesus is mine."

Who wrote Blessed Assurance?

Fanny Crosby was born in New York in 1820. As an infant she lost her sight, and she remained blind for nearly all of her ninety-four years. Rather than treat her blindness as a tragedy, she famously regarded it as a gift that turned her attention inward and upward. Over her long life she wrote thousands of hymn texts — by some counts more than eight thousand — under her own name and dozens of pen names.

Her collaborator on this hymn, Phoebe Palmer Knapp, was a wealthy friend and an amateur composer. The two often worked in exactly the way this hymn was born: Knapp supplying a melody, Crosby fitting words to what she heard.

A tune, then a text

The order matters. Knapp did not hand Crosby a poem to set. She played a tune and asked what it said. Crosby, listening, heard confidence in it — and out came a hymn about the settled certainty of belonging to Christ. "Blessed assurance, Jesus is mine! O what a foretaste of glory divine!"

The refrain is almost a song within the song: "This is my story, this is my song, praising my Saviour all the day long." For a woman who could not read a printed page, the hymn was carried, composed and remembered entirely in her mind before it was ever written down.

What "assurance" means

The hymn's subject is not fragile hope but assurance — the deep Christian confidence that one's standing with God rests on Christ and not on the ups and downs of feeling. "Heir of salvation, purchase of God, born of His Spirit, washed in His blood." Each line piles up reasons the assurance is safe: it is bought, it is Spirit-born, it is washed clean.

The later verses settle into rest and watchfulness — "perfect submission, all is at rest, I in my Saviour am happy and blest." This is not the giddy joy of a good day. It is the steady joy of someone who knows where she stands.

Why the story matters

It is easy to sing "this is my story" without a thought for whose story it first was. Fanny Crosby's life gives the words weight. She had every earthly reason to sing a smaller, sadder song, and instead she gave the church one of its great anthems of confidence. Her blindness did not dim her sight of Christ; if anything, it sharpened it.

For families and congregations, Blessed Assurance is a lesson in where certainty comes from. Not from circumstances, which change — but from a Saviour who does not.

Sitting with it at home

If you would like to study this hymn slowly, our Blessed Assurance Deep-Dive Study gathers Crosby's full public-domain text, the story of her life and her collaboration with Phoebe Knapp, the scripture behind each verse, and reflection questions for a week of readings.

You might also enjoy the story behind Amazing Grace or our guide to leading a hymn study at home.