They collaborated on several editions of Olney Hymns, which achieved lasting popularity. The first edition, published in 1779, contained 68 pieces by Cowper and 280 by Newton. However, these are the six stanzas that appeared, with minor spelling variations, in both the first edition in 1779 and the 1808 edition, the one nearest the date of Newton's death. It appeared under the heading Faith's Review and Expectation, along with a reference to First Chronicles chapter 17, verses 16 and 17. The origin of the melody is unknown.
Most hymnals attribute it to an early American folk melody.
Newton was not only a prolific hymn writer but also kept extensive journals and wrote many letters. Historians accredit his journals and letters for much of what is known today about the eighteenth century slave trade. In Cardiphonia, or the Utterance of the Heart, a series of devotional letters, he aligned himself with the Evangelical revival, reflecting the sentiments of his friend John Wesley and Methodism. In 1780 Newton left Olney to become rector of St. Mary Woolnoth, St. Mary Woolchurch, in London. There he drew large congregations and influenced many, among them William Wilberforce, who would one day become a leader in the campaign for the abolition of slavery.