Livingstone believed in trade, and wanted to see Christian missions established in central Africa. His motto on the base of the statue dedicated to him at Victoria Falls, was "Christianity, Commerce and Civilization". The reason he emphasised these three was that they would form an alternative to the slave trade, which was still rampant in Africa at that time. It would give the Africans some dignity when they met Europeans. The abolition of the African slave trade was his main hope. Around this time he believed the key to achieving these goals was the navigation of the Zambezi River as a Christian commercial highway into the interior. He returned to Britain to try to get support for his ideas, and to publish a book on his travels. The book brought him fame as one of the leading explorers of the age.