The great prophecies contained in the Olivet Discourse were uttered by the Lord prior to His crucifixion on Calvary. As He sat on the Mount of Olives, where in the future His feet shall stand in the day of His manifestation, He prophesied concerning the destruction of the magnificent temple building, and His disciples questioned Him, saying, "'Tell us when shall these things be? And what shall be the sign of Thy coming and of the end of the age?" (Matt. 24:3, R. V., margin). In answer to their questions, the Lord, looking through the years to the consummation of the age, pointed out certain unmistakable signs by which believers were to know when the age was drawing to a close. He saw kingdom rising against kingdom, and nation against nation. He heard the sound of war and rumors of war. He saw pestilence and earthquake, Bolshevism, Communism, anarchy, lawlessness. He saw a time of trouble, the like of which has not yet been known, a time which He called "the great tribulation." He spoke plainly concerning these matters in order that the believers in every age might be fully instructed. Among these conditions and events the Lord warned His disciples concerning the religious conditions that would prevail in the end time. "False Christs, and false prophets, shall arise," He declared. So great will be their delusions at that time that "if it were possible, they shall deceive the very elect." The Holy Spirit, coming on the day of Pentecost, heralded through Paul, Peter, James, and John, and the other inspired writers, the same warning, making it known that toward the end of the age the great foundational truths of the gospel will be denied. The word "Denial" will characterize the religious condition of Christendom when those closing days become reality. The days in which you and I are living are days in which Christians need to know their Bibles, for the only way by which we may know whether or not a system of teaching is of God is by viewing the system through the lens of Holy Writ--reading the system in the light of the Bible and not reading the Bible in the light of the system. Because of the crying need of Biblical light on these erroneous teachings, I gave a series of addresses in the Church of the Open Door, on "The Cult Kingdom," selecting ten of the most damaging heresies for discussion. When people saw them revealed in the searchlight of God's Word a large number of men and women, held in their grip, were mercifully delivered. This created a wide-spread interest among God's children, culminating in a demand for the printing of these addresses so that others, caught in the meshes of false doctrine, might also find freedom. I was about to comply with this request when I discovered a book compiled by William C. Irvine, called "HERESIES EXPOSED." This book completely covers not only the ten cults I exposed, but many others, so instead of publishing my addresses I have arranged with the writer to allow me to print this special edition of his excellent work. By so doing we meet the demand of friends for this material and provide my radio audience with another valuable book.