Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. 1 John 4:1.
Many will be ensnared through the belief that spiritualism is a merely human imposture; when brought face to face with manifestations which they cannot but regard as supernatural, they will be deceived, and will be led to accept them as the great power of God.
As the teachings of spiritualism are accepted by the churches, the restraint imposed upon the carnal heart is removed, and the profession of religion will become a cloak to conceal the basest iniquity. A belief in spiritual manifestations opens the door to seducing spirits and doctrines of devils, and thus the influence of evil angels will be felt in the churches.
The popular ministry cannot successfully resist spiritualism. They have nothing wherewith to shield their flocks from its baleful influence. Much of the sad result of spiritualism will rest upon ministers of this age; for they have trampled the truth under their feet, and in its stead have preferred fables.
Satan has long been preparing for his final effort to deceive the world. The foundation of his work was laid by the assurance given to Eve in Eden: “Ye shall not surely die.” “In the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil.” Genesis 3:4, 5. Little by little he has prepared the way for his masterpiece of deception in the development of spiritualism. He has not yet reached the full accomplishment of his designs; but it will be reached in the last remnant of time. Says the prophet: “I saw three unclean spirits like frogs….They are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.” Revelation 16:13, 14. Except those who are kept by the power of God, through faith in His word, the whole world will be swept into the ranks of this delusion. The people are fast being lulled to a fatal security, to be awakened only by the outpouring of the wrath of God.
From “Maranatha”, by Ellen White