Abraham Clifford was a proctor of Pembroke College, Cambridge, in the mid-17th century. After his ejection from the Church of England in 1662 or 1663, he studied medicine at Leyden. He later had a practice in London, where he died in 1675.
The text of this manuscript is apparently identical to Methodus Evangelica; or, the Gospel Method of Gods saving Sinners by Jesus Christ: Practically Explained in XII Propositions (London: Printed by J. M. for Brabazon Aylmer, 1676). According to an introduction by Thomas Manton and Richard Baxter, the text is a revised version of a sermon that Clifford delivered during a visit to Gloucestershire.
Sources
Calamy, Edmund. An Account of the Ministers, Lecturers, Masters and Fellows of Colleges and Schoolmasters, who were Ejected or Silenced after the Restoration in 1660... Volume II. London: Printed for J. Lawrence, in the Poultry; J. Nicholson, and J. Sprint, in Little-Britain; R. Robinson, in St. Paul's Church-Yard; N. Cliffe, and D. Jackson, in Cheapside, 1713.
Clifford, Abraham. Methodus Evangelica; or, the Gospel Method of Gods saving Sinners by Jesus Christ: Practically Explained in XII Propositions. London: Printed by J. M. for Brabazon Aylmer, 1676.
Oldmixon, John. The History of England, during the Reigns of the House of Stuart... London: Printed for John Pemberton, Fleet Street; Richard Ford, Richard Hett, and John Gray, in the Poultry, and Thomas Cox, under the Royal-Exchange, 1730.
Wood, Anthony A. Athenae Oxonienses, an Exact History of all the Writers and Bishops who have had their education in the University of Oxford. Volume IV. London: Printed for Lackington, Hughes, Harding, Mavor, and Jones, et al., 1820.