Business and pleasure, rightly understood, mutually assist each other, instead of being enemies, as silly or dull people often think them. No man tastes pleasures truly who does not earn them by previous business; and few people do business well who do nothing else.

Lord Chesterfield (1694-1773) English statesman, wit [Philip Dormer Stanhope]

Letter to his son, #189 (7 Aug 1749)
    (Source)