"In this journey, the understanding is the 'voiture' that must carry you through; and in proportion as that is stronger or weaker, more or less in repair, your journey will be better or worse; though at best you will now and then find some bad roads, and some bad inns."
— Stanhope, Philip Dormer, fourth earl of Chesterfield (1694-1773)
(I.lxxxi, p. 241 [44-5 in Roberts ed.], BATH, October 9, O.S. 1746)
Reading David Roberts' edition of Lord Chesterfield's Letters (Oxford: OUP, 1998); and searching text from Project Gutenberg <Link>
Consulting and citing, where possible, Letters Written by the late Right Honourable Philip Dormer Stanhope, Earl of Chesterfield, to his son, Philip Stanhope, Esq. (London: Printed for J. Dodsley, 1774). <Link to ECCO>
See also Miscellaneous Works of the late Philip Dormer Stanhope, Earl of Chesterfield: Consisting of letters to his Friends, never before printed, and Various Other Articles. 2 vols. (London: Printed for Edward and Charles Dilly, 1777). <Link to ECCO>