
July 21, 1763, p 514 http://books.google.com/books?id=JOseAAAAMAAJ&q="Truth+Sir+is+a+cow+which+will+yield+such+people+no+more+milk+and+so+they+are+gone+to+milk+the+bull1"&pg=PA514#v=onepage
Life of Samuel Johnson (1791), Vol I
Context: Hume, and other sceptical innovators, are vain men, and will gratify themselves at any expence. Truth will not afford sufficient food to their vanity; so they have betaken themselves to errour. Truth, Sir, is a cow which will yield such people no more milk, and so they are gone to milk the bull. If I could have allowed myself to gratify my vanity at the expence of truth, what fame might I have acquired.