It was at this point that he uttered his most famous quotation, ""I am prepared to go anywhere, provided it be forward."" He eventually returned home in 1864 after the government ordered the recall of the expedition because of its increasing costs and failure to find a navigable route to the interior. The Zambezi Expedition was castigated as a failure in many newspapers of the time, and Livingstone experienced great difficulty in raising funds to further explore Africa. Nevertheless, John Kirk, Charles Meller, and Richard Thornton, the scientists appointed to work under Livingstone, did contribute large collections of botanical, ecological, geological, and ethnographic material to scientific Institutions in the United Kingdom.