In 1773 Williams took a house in Lawrence Street,
Chelsea, married Mary Emilia, a woman without a fortune, and set up a school. As the fruit of his ministry he published a volume of
Sermons, chiefly upon Religious Hypocrisy (1774). His educational ideas, founded on those of
John Amos Comenius, he embodied in his
Treatise on Education (1774). Book-learning he subordinated to scientific training based on a first-hand knowledge of facts. He made a novel application of the
drunken helot plan, obtaining from a
workhouse a 'lying boy' as an object lesson. His school 'prospered beyond his expectations', but the death of his wife (in 1774) for a time unmanned him. He tore himself away, 'leaving his scholars to shift for themselves', and 'secluded himself in a distant country' for 'many months'. He went to
Buxton, according to some accounts; he never returned to Chelsea. In 1774
Benjamin Franklin 'took refuge from a political storm' in Williams's house, and became interested in his method of teaching arithmetic. Franklin joined a small club formed at Chelsea by Williams, the manufacturer
Thomas Bentley (partner of
Josiah Wedgwood), and
James "Athenian" Stuart. At this club Williams broached the scheme of a society for relieving distressed authors, which Franklin did not encourage him to pursue. It was noted at the club that most of the members, though 'good men', yet 'never went to church'. Franklin regretted the want of 'a rational form of devotion'. To supply this, Williams, with aid from Franklin, drew up a form. It was printed six times before it satisfied its sponsors, and was eventually published as
A Liturgy on the Universal Principles of Religion and Morality, 1776. On 7 April 1776, Williams opened for morning service a vacant chapel near
Cavendish Square (the building was replaced in 1858 by
All Saints, Margaret Street), using his liturgy, and reading lectures, with texts usually from the Bible, sometimes from classic authors. He got 'about a score of auditors', who seem to have been persons of distinction. The opening lecture was published. Copies of the liturgy were sent to
Frederick the Great and to
Voltaire, who returned appreciative letters in bad French and good English respectively. International botanical travellers Sir
Joseph Banks and
Daniel Solander 'now and then peeped into the chapel, and got away as fast as they decently could'. Williams's
Letter to the Body of Protestant Dissenters, 1777, is a plea for such breadth of toleration as would legally cover such services as his. All the expenses fell on Williams, who was saved from ruin only by the subscription to his
Lectures on the Universal Principles and Duties of Religion and Morality 1779. These lectures (critical rather than constructive, and not eloquent, though well written) were read at the chapel in 1776–1777. The experiment is said to have lasted four years, but it is probable that after the second year the services were not held in Margaret Street; they were transferred, on the advice of
Robert Melville, to a room in the
British Coffee House,
Cockspur Street, Melville giving a dinner in
Brewer Street after service, 'with excellent
Madeira'. The statement by
Thomas Somerville that Melville took him, in the period 1779–1785, to the service in 'Portland' Square is no doubt due to a slip of memory. Somerville's further statement that the 'dispersion of his flock' was due to Williams's 'immorality' becoming 'notorious' seems a groundless slander. No hint of it is conveyed in the satiric lampoon
Orpheus, Priest of Nature 1781, which affirms, on the contrary, that Williams's principles were too strict for his hearers. The appellation 'Priest of Nature' is said to have been first given him by Franklin; 'Orpheus' ascribes it to 'a Socratic woollen-draper of
Covent Garden'. Gregoire affirms that he had it from Williams that a number of his followers passed from
deism to
atheism. Williams now supported himself by taking private pupils. After the speech of Sir
George Savile on 17 March 1779 in favour of an amendment of the
Toleration Act, Williams published a letter on
The Nature and Extent of Intellectual Liberty, 1779, claiming that
religious toleration should be without restriction. It was answered by
Manasseh Dawes. In the same year, and with the same object, he translated and published Voltaire's
Treatise on Toleration,
Ignorant Philosopher and
Commentary on Beccaria. In 1780 he issued
A Plan of Association on Constitutional Principles; and on the formation of county associations for parliamentary reform he published his
Letters on Political Liberty (1782). This was translated into French the following year by
Jacques Pierre Brissot, then in London conducting the
Lyceum.
Jean-Marie Roland, vicomte de la Platière, a friend of Brissot, visited London in 1784, when Williams made his acquaintance. Williams's publications at this period include
Letters concerning Education 1785;
Royal Recollections on a Tour to Cheltenham (anon.), 1788;
Lectures on Political Principles 1789;
Lectures on Education, 1789;
Lessons to a Young Prince (anon.), 1790. ==Literary fund==