But when we enter into a serious and impartial detail concerning this knowledge, and analyse carefully what the great pretenders to it have given and give us daily for knowledge, we shall be obliged to confess, that the human intellect is rather a rank than a fertile soil, barren without due culture, and apt to shoot up tares and weeds with too much."
— St John, Henry, styled first Viscount Bolingbroke (1678-1751)
(Essay I, §4; vol. iii, p. 409)
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).