There were many in Christ’s day, as there are today, over whom the control of Satan for the time seemed broken; through the grace of God they were set free from the evil spirits that had held dominion over the soul. They rejoiced in the love of God; but, like the stony-ground hearers of the parable, they did not abide in His love. They did not surrender themselves to God daily, that Christ might dwell in the heart; and when the evil spirit returned, with “seven other spirits more wicked than himself,” they were wholly dominated by the power of evil.
When the soul surrenders itself to Christ, a new power takes possession of the new heart. A change is wrought which man can never accomplish for himself. It is a supernatural work, bringing a supernatural element into human nature. The soul that is yielded to Christ becomes His own fortress, which He holds in a revolted world, and He intends that no authority shall be known in it but His own. A soul thus kept in possession by the heavenly agencies is impregnable to the assaults of Satan. But unless we do yield ourselves to the control of Christ, we shall be dominated by the wicked one. We must inevitably be under the control of the one or the other of the two great powers that are contending for the supremacy of the world. It is not necessary for us deliberately to choose the service of the kingdom of darkness in order to come under its dominion. We have only to neglect to ally ourselves with the kingdom of light. If we do not co-operate with the heavenly agencies, Satan will take possession of the heart, and will make it his abiding place. The only defense against evil is the indwelling of Christ in the heart through faith in His righteousness. Unless we become vitally connected with God, we can never resist the unhallowed effects of self-love, self-indulgence, and temptation to sin. We may leave off many bad habits, for the time we may part company with Satan; but without a vital connection with God, through the surrender of ourselves to Him moment by moment, we shall be overcome. Without a personal acquaintance with Christ, and a continual communion, we are at the mercy of the enemy, and shall do his bidding in the end.
– The Desire of Ages, pgs. 323, 324