"Until this time all heaven had been in order, harmony, and perfect subjection to the government of God. It was the highest sin to rebel against His order and will. All heaven seemed in commotion. The angels were marshaled in companies, each division with a higher commanding angel at its head. Satan, ambitious to exalt himself, and unwilling to submit to the authority of Jesus, was insinuating against the government of God. Some of the angels sympathized with Satan in his rebellion, and others strongly contended for the honor and wisdom of God in giving authority to His Son. There was contention among the angels. Satan and his sympathizers were striving to reform the government of God. They wished to look into His unsearchable wisdom, and ascertain His purpose in exalting Jesus and endowing Him with such unlimited power and command. They rebelled against the authority of the Son. All the heavenly host were summoned to appear before the Father to have each case decided. It was there determined that Satan should be expelled from heaven, with all the angels who had joined him in the rebellion. Then there was war in heaven. Angels were engaged in the battle; Satan wished to conquer the Son of God and those who were submissive to His will. But the good and true angels prevailed, and Satan, with his followers, was driven from heaven.
{EW 145.2}

"After Satan and those who fell with him were shut out of heaven, and he realized that he had forever lost all its purity and glory, he repented, and wished to be reinstated in heaven. He was willing to take his proper place, or any position that might be assigned him. But no; heaven must not be placed in jeopardy. All heaven might be marred should he be taken back; for sin originated with him, and the seeds of rebellion were within him. Both he and his followers wept, and implored to be taken back into the favor of God. But their sin -- their hatred, their envy and jealousy -- had been so great that God could not blot it out. It must remain to receive its final punishment.
{EW 146.1}

"When Satan became fully conscious that there was no possibility of his being brought again into favor with God, his malice and hatred began to be manifest. He consulted with his angels, and a plan was laid to still work against God's government. When Adam and Eve were placed in the beautiful garden, Satan was laying plans to destroy them. In no way could this happy couple be deprived of their happiness if they obeyed God. Satan could not exercise his power upon them unless they should first disobey God and forfeit His favor. Some plan must therefore be devised to lead them to disobedience that they might incur God's frown and be brought under the more direct influence of Satan and his angels. It was decided that Satan should assume another form and manifest an interest for man. He must insinuate against God's truthfulness and create doubt whether God did mean just what He said; next, he must excite their curiosity, and lead them to pry into the unsearchable plans of God -- the very sin of which Satan had been guilty -- and reason as to the cause of His restrictions in regard to the tree of knowledge."
{EW 146.2}

"Then there was war in Heaven. The Son of God, the Prince of Heaven, and His loyal angels, engaged in conflict with the arch rebel and those who united with him. The Son of God and true, loyal angels prevailed; and Satan and his sympathizers were expelled from Heaven. All the heavenly host acknowledged and adored the God of justice. Not a taint of rebellion was left in Heaven. All was again peaceful and harmonious as before.
{1SP 22.3}

"Angels in Heaven mourned the fate of those who had been their companions in happiness and bliss. Their loss was felt in Heaven. The Father consulted Jesus in regard to at once carrying out their purpose to make man to inhabit the earth. He would place man upon probation to test his loyalty, before he could be rendered eternally secure. If he endured the test wherewith God saw fit to prove him, he should eventually be equal with the angels. He was to have the favor of God, and he was to converse with angels, and they with him. He did not see fit to place them beyond the power of disobedience.
{1SP 23.1}

"The Father and the Son engaged in the mighty, wondrous work they had contemplated, of creating the world. The earth came forth from the hand of the Creator exceedingly beautiful. There were mountains, and hills, and plains; and interspersed among them were rivers and bodies of water."
{1SP 24.1}