The work had to contend with governmental opposition. When a place was first opened at Madrid for gospel services, a sign was placed outside, announcing the fact. Official orders were issued that the sign should be painted over, so as to obliterate the inscription. The painter of the sign, unwilling both to undo his own work and to hinder the work of God, painted the sign over with water-colours, which would leave the original announcement half visible, and would soon be washed off by the rains; whereupon the government sent its own workman to daub the sign over with thick oil-colour. Mr. Muller, ready to preach the gospel to those at Rome also, felt his spirit saddened and stirred within him, as he saw that city wholly given to idolatry--not pagan but papal idolatry--the Rome not of the Caesars, but of the popes. While at Naples he ascended Vesuvius. Those masses of lava, which seemed greater in bulk than the mountain itself, more impressed him with the power of God than anything else he had ever seen. As he looked upon that smoking cone, and thought of the liquid death it had vomited forth, he said within himself, "What cannot God do!" He had before felt somewhat of His Almightiness in love and grace, but he now saw its manifestation in judgment and wrath. His visit to the Vaudois valleys, where so many martyrs had suffered banishment and imprisonment, loss of goods and loss of life for Jesus' sake, moved him to the depths of his being and stimulated in him the martyr spirit. When he arrived again in Bristol, June 18, 1879, he had been absent nine months and twelve days, and preached two hundred and eighty-six times and in forty-six towns and cities. After another ten weeks in Bristol, he and his wife sailed again for America, the last week of August, 1879, landing at New York the first week in September. This visit took in the States lying between the Atlantic Ocean and the valley of the Mississippi--New York and New Jersey, Ohio, Indiana, Michigan and Illinois, Wisconsin, Iowa, Minnesota--and, from London and Hamilton to Quebec, Canada also shared the blessing. This visit covered only two hundred and seventy-two days, but he preached three hundred times, and in over forty cities. Over one hundred and fifty written invitations still remained without response, and the number increased the longer his stay. Mr. Muller therefore assuredly gathered that the Lord called him to return to America, after another brief stay at Bristol, where he felt it needful to spend a season annually, to keep in close touch with the work at home and relieve Mr. and Mrs. Wright of their heavy responsibilities, for a time.