Dear friends, do not believe every spirit, but test the spirits to determine if they are from God, because many false prophets have gone out into the world.
1 John 4:1
Our tester to test the spirits or in other words to see what message they bring is by comparing it to what Holy Scripture has already revealed. Either their message is based on God’s Word through the interpretation of the Holy Spirit or a twisting of God’s Word through the interpretation of demons (1 Timothy 4:1). The only way we as Christians can use the tester (God’s Word) effectively is when we read it every day.