Isaiah 14:13 For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north: 14 I will ascend above the heights of the clouds; I will be like the most High.
[The Great Controversy pp 495] Leaving his place in the immediate presence of God, Lucifer went forth to diffuse the spirit of discontent among the angels. Working with mysterious secrecy, and for a time concealing his real purpose under an appearance of reverence for God, he endeavored to excite dissatisfaction concerning the laws that governed heavenly beings, intimating that they imposed an unnecessary restraint. Since their natures were holy, he urged that the angels should obey the dictates of their own will. He sought to create sympathy for himself, by representing that God had dealt unjustly with him in bestowing supreme honor upon Christ.
He claimed that in aspiring to greater power and honor he was not aiming at self-exaltation, but was seeking to secure liberty for all the inhabitants of Heaven, that by this means they might attain to a higher state of existence. pardon, on condition of repentance and submission. Such efforts as only infinite love and wisdom could devise, were made to convince him of his error. The spirit of discontent had never before been known in Heaven. Lucifer himself did not at first see whither he was drifting; he did not understand the real nature of his feelings.
But as his dissatisfaction was proved to be without cause, Lucifer was convinced that he was in the wrong, that the divine claims were just, and that he ought to acknowledge them as such before all Heaven. Had he done this, he might have saved himself and many angels. God, in his great mercy, bore long with Lucifer. He was not immediately degraded from his exalted station when he first indulged the spirit of discontent, nor even when he began to present his false claims before the loyal angels. Long was he retained in Heaven.
Ecclesiastes 8:1 Because sentence against an evil work is not executed speedily, therefore the heart of the sons of men is fully set in them to do evil. 12 Though a sinner do evil an hundred times, and his days be prolonged, yet surely I know that it shall be well with them that fear God, which fear before him.
May The Lord add His blessing to the study of His word. God bless!