Because of Adam’s sin, the whole world became subject to sin and the rule of Satan. The devil, also called the prince of the world, blinds people from seeing and believing in the truth of the gospel. In this sermon on Ephesians 6:10–13 titled “The Strong Man Disarmed,” Dr. Martyn Lloyd-Jones describes the way Christ has broken the grip that the evil one has on the world. For Jesus has bound the strong man and by the proclamation of the gospel, the works of Satan and all who follow him are destroyed. This means that Christians can take the gospel to the ends of the earth knowing that Jesus has overcome the evil forces that once dominated this world. Even while Satan and his demons still have some control and influence in the world, the day will come when Christ will return and vanquish the devil and all who worship him once and for all. As Dr. Lloyd-Jones explains, Christ Jesus will bring to completion what which He started on the cross when He comes again to bring the new heaven and earth. This gives all who love Christ confidence and boldness knowing that He has overcome the devil and will finally defeat him on the last day.

http://www.mljtrust.org/sermons/the-strong-man-disarmed/