In 1872, after the death of his first wife in 1870, he got married to Susannah Grace Sanger. In 1875, at the age of 70, he began a 17-year period of missionary travel. He preached in the United States, India, Australia, Japan, China, and nearly forty other countries. He traveled over 200,000 miles, and that was before the airplane was invented. Because he knew several languages, he was able to preach in English, French, and German. His sermons were translated into over twelve other languages.