Anglican priest
In 1755, Newton was appointed as tide surveyor (a tax collector) of the Port of Liverpool, again through the influence of Manesty. In his spare time, Newton studied Greek, Hebrew, and Syriac, preparing for serious religious study. He became well known as an evangelical lay minister. In 1757, Newton applied to be ordained as a priest in the Church of England, but it was more than seven years before he was eventually accepted. During this period, Newton also applied to the Independents and Presbyterians. He mailed applications directly to the Bishops of Chester and Lincoln and the Archbishops of Canterbury and York.
Eventually, in 1764, Newton was introduced by Thomas Haweis to The 2nd Earl of Dartmouth, who was influential in recommending Newton to William Markham, Bishop of Chester. Haweis suggested Newton for the living of Olney, Buckinghamshire. On 29 April 1764, Newton received deacon's orders, and was finally ordained as a priest on 17 June.
As curate of Olney, Newton was partly sponsored by John Thornton, a wealthy merchant and philanthropist. He supplemented Newton's stipend of £60 a year with £200 a year "for hospitality and to help the poor". Newton soon became well known for his pastoral care, as much as for his beliefs. Newton's friendship with Dissenters and evangelical clergy led to his being respected by Anglicans and Nonconformists alike. Newton spent 16 years at Olney. His preaching was so popular that the congregation added a gallery to the church to accommodate the many persons who flocked to hear him.
In 1772, Thomas Scott took up the curacy of the neighbouring parishes of Stoke Goldington and Weston Underwood. Newton was instrumental in converting Scott from a cynical 'career priest' to a true believer, a conversion which Scott related in his spiritual autobiography The Force of Truth (1779). Later, Scott became a biblical commentator and co-founder of the Church Missionary Society.
In 1779, Newton was invited by John Thornton to become Rector of St Mary Woolnoth, Lombard Street, London, where he officiated until his death. The church was built by Nicholas Hawksmoor in 1727 in the fashionable Baroque style. Newton was one of only two evangelical Anglican priests in the capital, and he soon found himself gaining in popularity amongst the growing evangelical party. Newton was a strong supporter of evangelicalism in the Church of England. He remained a friend of Dissenters (such as Methodists post-Wesley, and Baptists) as well as Anglicans.
Young churchmen and people struggling with faith sought his advice, including such well-known social figures as the writer and philanthropist Hannah More, and the young William Wilberforce, a member of parliament (MP) who had recently suffered a crisis of conscience and religious conversion while contemplating leaving politics. The younger man consulted with Newton, who encouraged Wilberforce to stay in Parliament and "serve God where he was".
In 1792, Newton was presented with the degree of Doctor of Divinity by the College of New Jersey (now Princeton University).