his quote is saying that Satan, who is often considered to be a symbol of evil, wants to control your thoughts. He does this by telling you lies and trying to convince you to believe them. In order to protect yourself from Satan's influence, you should fill your mind with God's word. This means reading and studying religious texts, which are believed to contain the truth about God and the world.
The quote suggests that the best way to defend yourself against Satan's lies is to arm yourself with the truth. By filling your mind with God's word, you can develop a strong sense of faith and a deep understanding of what is right and wrong. This will help you to resist temptation and stay true to your beliefs, even when faced with challenges or difficult situations.
Overall, the quote is a reminder that our thoughts are powerful, and we should be careful about what we allow into our minds. By focusing on God's word, we can protect ourselves from negative influences and cultivate a sense of inner peace and strength.