"It is hard for another reason; because imagination, whose talents are neither precision nor propriety, not the former at least, is employed in the application of one of these sets of ideas and words to the other, and because it rarely happens that great heat of imagination, and great coolness of judgment, that happy association which forms a genius, and appears eminently in all your writings, go together, and keeps pace with one another."
— St John, Henry, styled first Viscount Bolingbroke (1678-1751)
(Essay I, §5; vol. iii, p. 444)
See "Letters or Essays Addressed to Alexander Pope, Esq." in the third volume of David Mallet's The Works of the Late Right Honorable Henry St. John, Lord Viscount Bolingbroke, 5 vols. (London : [s.n.], Printed in the Year 1754). <Link to ESTC><Link to ESTC>
Text from the third volume of The Works of the Late Right Honorable Henry St. John, Lord Viscount Bolingbroke, 5 vols. (Dublin: Printed by P. Byrne: 1793). <Link to Google Books>
Reading also in the 1967 reprint of The Works of Lord Bolingbroke, 4 vols. (London: Henry G. Bohn, 1844).