The knowledge he sought was studiously kept from him in his Jewish home;but, when only eleven years old, he left his father's house and went out into the world to gain for himself an education, to choose his religion and his lifework. He found a home for a time with kinsmen, but was soon driven from them as an apostate, and alone and penniless he had to make his own way among strangers. He went from place to place, studying diligently and maintaining himself by teaching Hebrew. Through the influence of a Catholic instructor he was led to accept the Romish faith and formed the purpose of becoming a missionary to his own people. With this object he went, a few years later, to pursue his studies in the College of the Propaganda at Rome.
Here his habit of independent thought and candid speech brought upon him the imputation of heresy. He openly attacked the abuses of the church and urged the necessity of reform. Though at first treated with special favor by the papal dignitaries, he was after a time removed from Rome. Under the surveillance of the church he went from place to place, until it became evident that he could never be brought to submit to the bondage of Romanism.
He was declared to be incorrigible and was left at liberty to go where he pleased. He now made his way to England and, professing the Protestant faith, united with the English Church. After two years' study he set out, in 1821, upon his mission.
While Wolff accepted the great truth of Christ's first advent as "a Man of Sorrows, and acquainted with grief," he saw that the prophecies bring to view with equal clearness His second advent with power and glory. And while he sought to lead his people to Jesus of Nazareth as the Promised One, and to point them to His first coming in humiliation as a sacrifice for the sins of men, he taught them also of His second coming as a king and deliverer.
"Jesus of Nazareth, the true Messiah," he said, "whose hands and feet were pierced, who was brought like a lamb to the slaughter, who was the Man of Sorrows and acquainted with grief, who after the scepter was taken from Judah, and the legislative power from between his feet, came the first time;shall come the second time in the clouds of heaven, and with the trump of the Archangel" (Joseph Wolff, Researches and Missionary Labors, page 62)"and shall stand upon the Mount of Olives; and that dominion, once consigned to Adam over the creation, and forfeited by him (Genesis 1:26; 3:17), shall be given to Jesus. He shall be king over all the earth. The groanings and lamentations of the creation shall cease, but songs of praises and thanksgivings shall be heard. ... When Jesus comes in the glory of His Father, with the holy angels,... the dead believers shall rise first. 1Thessalonians 4:16; 1 Corinthians 15:32. This is what we Christians call the first resurrection. Then the animal kingdom shall change its nature (Isaiah 11:6-9), and be subdued unto Jesus. Psalm 8. Universal peace shall prevail."--Journal of the Rev. Joseph Wolff, pages 378, 379. "The Lord again shall look down upon the earth, and say, 'Behold, it is very good.'"--Ibid., page 294.
Wolff believed the coming of the Lord to be at hand, his interpretation of the prophetic periods placing the great consummation within a very few years of the time pointed out by Miller. To those who urged from the scripture, "Of that day and hour knoweth no man," that men are to know nothing concerning the nearness of the advent, Wolff replied: "Did our Lord say that that day and hour should never be known? Did He not give us signs of the times, in order that we may know at least the approach of His coming, as one knows the approach of the summer by the fig tree putting forth its leaves? Matthew 24:32. Are we never to know that period, whilst He Himself exhorteth us not only to read Daniel the prophet, but to understand it? and in that very Daniel, where it is said that the words were shut up to the time of the end (which was the case in his time), and that 'many shall run to and fro' (a Hebrew expression for observing and thinking upon the time), 'and knowledge'(regarding that time) 'shall be increased.' Daniel 12:4. Besides this, our Lord does not intend to say by this, that the approach of the time shall not be known, but that the exact 'day and hour knoweth no man.' Enough, He does say, shall be known by the signs of the times, to induce us to prepare for His coming, as Noah prepared the ark."--Wolff, Researches and Missionary Labors, pages 404, 405.
Concerning the popular system of interpreting, or misinterpreting, the Scriptures, Wolff wrote: "The greater part of the Christian church have swerved from the plain sense of Scripture, and have turned to the phantomizing system of the Buddhists, who believe that the future happiness of mankind will consist in moving about in the air, and suppose that when they are reading Jews they must understand Gentiles; and when they read Jerusalem, they must understand the church; and if it is said earth, it means sky; and for coming of the Lord they must understand the progress of the missionary societies; and going up to the mountain of the Lord's house, signifies a grand class meeting of Methodists." --Journal of the Rev. Joseph Wolff, page 96.