Pope gradually persuaded himself that all the works of these years, the
'Essay on Man', the 'Satires, Epistles', and 'Moral Essays', were but
parts of one stupendous whole. He told Spence in the last years of his
life: "I had once thought of completing my ethic work in four
books.--The first, you know, is on the Nature of Man [the 'Essay on
Man']; the second would have been on knowledge and its limits--here
would have come in an Essay on Education, part of which I have inserted
in the 'Dunciad' ['i.e.' in the Fourth Book, published in 1742]. The
third was to have treated of Government, both ecclesiastical and
civil--and this was what chiefly stopped my going on. I could not have
said what 'I would' have said without provoking every church on the face
of the earth; and I did not care for living always in boiling
water.--This part would have come into my 'Brutus' [an epic poem which
Pope never completed], which is planned already. The fourth would have
been on Morality; in eight or nine of the most concerning branches of
it."

It is difficult, if not impossible, to believe that Pope with his
irregular methods of work and illogical habit of thought had planned so
vast and elaborate a system before he began its execution. It is far
more likely that he followed his old method of composing on the
inspiration of the moment, and produced the works in question with
little thought of their relation or interdependence. But in the last
years of his life, when he had made the acquaintance of Warburton, and
was engaged in reviewing and perfecting the works of this period, he
noticed their general similarity in form and spirit, and, possibly under
Warburton's influence, conceived the notion of combining and
supplementing them to form that "Greater Essay on Man" of which he spoke
to Spence, and of which Warburton himself has given us a detailed