As a consequence for his foolish attempt to usurp God, Satan was cast down from his position of glory and honor. And ever since his humiliating fall from grace, Satan has been resentful, full of hatred for God and God’s plans for humanity. So he spends all his time trying to tarnish, thwart, upend, divert, destroy, etc., all of God’s plans and God’s work in the lives of people. Moreover, he wants to steal away our joy, plunge us into misery, inflict us with suffering, and hinder or stop our works of loving service to others, on God’s behalf. There is absolutely no good in Satan. He is tireless in his works of sin and evil. He is a liar and murderer, he is corrupt to the core, and all who follow him in sin and wickedness are his children: “You are of your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it” (John 8:44). We also know from 1 John 3:8 that Satan has been sinning almost from the beginning of His existence; pride and the resultant sin was in him very soon after he was created.
Fortunately, Jesus has come to destroy Satan’s works of darkness: “He who sins is of the devil, for the devil has sinned from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil” (1 John 3:8). Jesus does this work at least two ways: (1) by reconciling us to God, and (2) by working through us once we are saved to project God’s will upon the earth, thereby undermining Satan’s work and reclaiming people and ground from Satan (works of evil that Satan tirelessly produces). Satan is tireless, but as a created being, he has limitations, unlike our God, so the defeat of Satan is unavoidable. God’s love, power, wisdom, and reach are just way too much for Satan to battle. For now, as we live in the age of grace, God in His Infinite Wisdom allows Satan and those people who follow Satan to weave mischief and even produce great works of evil (such as war and genocide), but they all operate within the boundaries that God sets. God is, always has been, and always will be in complete control of creation and all within it.
I pray that you will discover God's purpose, plan, and control in your life.