The secret of Satan's power over God's professed people lies in the deceitfulness of the human heart. Their constant stumbling and falling reveal that they have not maintained a stern conflict with their besetting sins. They have not depended wholly upon Christ, because they have not realized that they are in peril of being overcome by these sins. It is the sin which appears small and unworthy of our notice against which we should be on our guard. If we could understand how deeply we injure our own souls and cause unhappiness to those around us by giving loose rein to unsanctified thoughts and unholy actions, we would strive to put them away. We would co-operate with God in working out our own salvation. {ST, December 13, 1899 par. 1}
