 If you want to protect yourself spiritually from being led away from the truth by error, if you want to be able to discern between good and evil, right and wrong, truth and error, the best way, the Bible tells us, is grow in the grace and the knowledge of the Lord Jesus Christ. In other words, pick up your Bible and read it, and read it every day, and meditate in God's Word, and start on that milk diet, but then advance later to more solid food of God's Word.