What does the Bible say about Satan's deception?

Satan is described in scripture as a being who operates through deception. In 2 Corinthians 11, Paul notes that Satan disguises himself as an angel of light, which means he can present false teaching that appears benign or even good. This deceptive nature is highlighted in Revelation, where two beasts are depicted—one from the sea representing ungodly governments and another from the earth symbolizing false religions. The second beast, though appearing like a lamb, speaks like a dragon, indicating that it carries a message opposed to the truth of Christ. This is a reminder for Christians to be discerning about what is taught and to ensure it aligns with the Gospel.