Speaking of his ministerial and missionary work in Christ Church, the doctor said:
"The special blessing of the Church consisted in the regular exposition of the Old Testament. It has been my custom to expound the Old Testament every Sunday evening, from the first Sunday I came into office (Jan. 5th, 1868) up to the present time. It was the first time in Berlin that this was made a practice. There were, therefore, from the very beginning hearers, consisting of Jews and earnest Christians. Those expository sermons have been the greatest blessing, and have specially united me to the congregation."
Professor Cassel baptized 262 Jews in Christ Church; amongst them doctors, authors, merchants, nearly all educated persons. But, as he said, "I am not fond of statistics. I sow the seed, but do not stop to ask how much may be the fruit."
Dr. Cassel was an ardent lover of his own people. "Though he has left us, he was by no means our enemy. He still fights against those who hate the Jews," said the "Jewish Chronicle." It was he who raised his voice against Stöcker in Berlin, and endeavoured by voice and pen to soften down the excitement and anger of German Protestants, and to secure the peace of his former brethren in the faith.
In the spring of 1891, when he retired from his duties, Dr. Cassel did not cease to preach, wherever an occasion offered, and he continued to write. So great was his love and zeal that he could not forego instructing and baptizing Jews who wished to become members of the Church of Christ through his instrumentality. The number of his converts must exceed some hundreds. Many of them were in high positions, and residing in various parts of the world.
Dr. Cassel's death took place, after great sufferings, on December 23rd, 1893, his last words being, "Wo ist denn das Himmelreich?" His funeral was held on December 27th in the afternoon. In Christ Church, where the coffin had been placed before the communion-table, a funeral sermon was preached by the Rev. Pastor Weser from St. John i. 12. The Rev. Dr. Dryander, the General Superintendent of the Lutheran community, also addressed the congregation. After the service within the sacred edifice the obsequies were completed, in the presence of a large concourse of friends, at the old Jerusalem Cemetery, where Dr. Cassel's mortal remains lie in their last resting-place.
We append a few testimonies to the life, example, and powerful influence of Dr. Cassel:
Mr. C. Urbschat, of Königsberg, who for several years worked under Dr. Cassel in Berlin, wrote of his labours:—
"Professer Cassel was a highly educated missionary, and showed extraordinary ability in influencing the higher classes of Jews in favour of Christianity by his lectures and by his pleadings on their behalf. He was a man of profound learning, of great diligence, and of restless zeal in propagating the Gospel of his Master amongst Jews and Christians."
The "Allgemeine Zeitung des Judenthums" said:— "When the anti-Semites began to show themselves, Cassel remembered his origin, and opposed the leaders, Stöcker, Wagner, and others with great decision and manliness. It was this manly action that gives us some satisfaction for his desertion of the parental religion. We have to judge this apostasy very differently from that of many others in former and present times, as he did not forsake his old creed for any worldly reason, or to get honours and position, but rather because he followed a mystical line of thought. God alone can judge the veracity and purity of his life; we dare not. 'Peace be to his ashes!'"