At this very time, calling upon Dr. Tholuck, he was asked, to his surprise, whether he had ever felt a desire to _labour among the Jews_--Dr. Tholuck then acting as agent for the London Missionary Society for promoting missions among them. This question naturally fanned the flame of his already kindled desire; but, shortly after, Bucharest being the seat of the war then raging between the Russians and Turks, the project of sending a minister there was for the time abandoned. But a door seemed to open before him just as another shut behind him. The committee in London, learning that he was available as a missionary to the Jews, proposed his coming to that city for six months as a missionary student to prepare for the work. To enter thus on a sort of probation was trying to the flesh, but, as it seemed right that there should be opportunity for mutual acquaintance between committee and candidate, to insure harmonious cooperation, his mind was disposed to accede to the proposal. There was, however, a formidable obstacle. Prussian male subjects must commonly serve three years in the army, and classical students who have passed the university examinations, at least one year. George Muller, who had not served out even this shorter term, could not, without royal exemption, even get a passport out of the country. Application was made for such exemption, but it failed. Meanwhile he was taken ill, and after ten weeks suffered a relapse. While at Leipzig with an American professor with whom he went to the opera, he unwisely partook of some refreshments between the acts, which again brought on illness. He had broken a blood-vessel in the stomach, and he returned to Halle, never again to enter a theatre. Subsequently being asked to go to Berlin for a few weeks to teach German, he went, hoping at the Prussian capital to find access to the court through persons of rank and secure the desired exemption. But here again he failed. There now seemed no way of escaping a soldier's term, and he submitted himself for examination, but was pronounced physically unfit for military duty. In God's providence he fell into kind hands, and, being a second time examined and found unfit, he was thenceforth _completely exempted for life from all service in the army._ God's lines of purpose mysteriously converged. The time had come; the Master spake and it was done: all things moved in one direction--to set His servant free from the service of his country, that, under the Captain of his salvation, he might endure hardness as a good soldier of Christ, without entanglement in the affairs of this life. Aside from this, his stay at the capital had not been unprofitable, for he had preached five times a week in the poorhouse and conversed on the Lord's days with the convicts in the prison.