I just thought this might help people realize how serious it is to disregard this subject:
Early Writings of Ellen G. White, page 43, paragraph 1
Chapter Title: Experience and Views
The enemies of the present truth have been trying to open the door of the holy place, that Jesus has shut, and to close the door of the most holy place, which He opened in 1844, where the ark is, containing the two tables of stone on which are written the ten commandments by the finger of Jehovah.
Satan is now using every device in this sealing time to keep the minds of God's people from the present truth and to cause them to waver. I saw a covering that God was drawing over His people to protect them in the time of trouble; and every soul that was decided on the truth and was pure in heart was to be covered with the covering of the Almighty.
Satan knew this, and he was at work in mighty power to keep the minds of as many people as he possibly could wavering and unsettled on the truth. I saw that the mysterious knocking in New York and other places was the power of Satan, and that such things would be more and more common, clothed in a religious garb so as to lull the deceived to greater security and to draw the minds of God's people, if possible, to those things and cause them to doubt the teachings and power of the Holy Ghost.
I saw that Satan was working through agents in a number of ways. He was at work through ministers who have rejected the truth and are given over to strong delusions to believe a lie that they might be damned. While they were preaching or praying, some would fall prostrate and helpless, not by the power of the Holy Ghost, but by the power of Satan breathed upon these agents, and through them to the people. While preaching, praying, or conversing, some professed Adventists who had rejected present truth used mesmerism to gain adherents, and the people would rejoice in this influence, for they thought it was the Holy Ghost. Some even that used it were so far in the darkness and deception of the devil that they thought it was the power of God, given them to exercise. They had made God altogether such a one as themselves and had valued His power as a thing of nought.
Some of these agents of Satan were affecting the bodies of some of the saints--those whom they could not deceive and draw away from the truth by a Satanic influence. Oh, that all could get a view of it as God revealed it to me, that they might know more of the wiles of Satan and be on their guard! I saw that Satan was at work in these ways to distract, deceive, and draw away God's people, just now in this sealing time. I saw some who were not standing stiffly for present truth. Their knees were trembling, and their feet sliding, because they were not firmly planted on the truth, and the covering of Almighty God could not be drawn over them while they were thus trembling.
Satan was trying his every art to hold them where they were, until the sealing was past, until the covering was drawn over God's people, and they left without a shelter from the burning wrath of God, in the seven last plagues. God has begun to draw this covering over His people, and it will soon be drawn over all who are to have a shelter in the day of slaughter. God will work in power for His people; and Satan will be permitted to work also....
pg 55
I saw the Father rise from the throne, and in a flaming chariot go into the holy of holies within the veil, and sit down. Then Jesus rose up from the throne, and the most of those who were bowed down arose with Him. I did not see one ray of light pass from Jesus to the careless multitude after He arose, and they were left in perfect darkness. Those who arose when Jesus did, kept their eyes fixed on Him as He left the throne and led them out a little way. Then He raised His right arm, and we heard His lovely voice saying, "Wait here; I am going to My Father to receive the kingdom; keep your garments spotless, and in a little while I will return from the wedding and receive you to Myself." Then a cloudy chariot, with wheels like flaming fire, surrounded by angels, came to where Jesus was. He stepped into the chariot and was borne to the holiest, where the Father sat. There I beheld Jesus, a great High Priest, standing before the Father. On the hem of His garment was a bell and a pomegranate, a bell and a pomegranate. Those who rose up with Jesus would send up their faith to Him in the holiest, and pray, "My Father, give us Thy Spirit." Then Jesus would breathe upon them the Holy Ghost. In that breath was light, power, and much love, joy, and peace.
I turned to look at the company who were still bowed before the throne; they did not know that Jesus had left it. Satan appeared to be by the throne, trying to carry on the work of God. I saw them look up to the throne, and pray, "Father, give us Thy Spirit." Satan would then breathe upon them an unholy influence; in it there was light and much power, but no sweet love, joy, and peace. Satan's object was to keep them deceived and to draw back and deceive God's children."