The document contains multiple passages from the Bible that reference spiritual battles against evil forces such as the devil and demons. It encourages Christians to be strong in God's power by putting on spiritual armor in order to stand against the devil's schemes, as the struggle is not against human opponents but against spiritual rulers and authorities from the dark world and heavenly realms. Satan is described as the ancient serpent who deceives the world, while Jesus defeated him and the power of death through his resurrection. Believers are called to resist the devil who prowls like a roaring lion, as he comes to steal, kill and destroy, in contrast to Jesus who came to bring life.