All people deal with intrusive thoughts at times. All of us have some practices in our lives we are not proud of. Many would call these struggles sins. Why are there thoughts and deeds we hate, yet that recur so often in our lives? The Bible teaches there is a real, supernatural source behind these thoughts and deeds. Satan is real but so is God. God's word has all the truth and power we need to set us free from the influence of sin and Satan. Satan will use the events of our personal lives to convince us that lies are true. He is very convincing. He will lie to us about God, about ourselves, about the gospel, and about all of life. He roots his lies in enough truth to make them very believable. Discerning them is not always easy. Satan is very crafty, shrewd, and subtle. God's word and Spirit are able to give us all that we need to take each sinful thought captive. Further, God supplies the truth that must replace Satan's lies. God's truth is the foundation for a holy life. God's truth is the pure substance we need to replace the roots of our sinful practices.