Happy - more power than the demons

In Luke chapter 10, Jesus had sent out 72 people to preach the Gospel.
Luke 10:17-20 says: When the 72 followers came back from their trip, they were very happy. They said, “Lord, even the demons obeyed us when we used your name!” Jesus said to them, “I saw Satan falling like lightning from the sky. He is the enemy, but know that I have given you more power than he has. I have given you power to crush his snakes and scorpions under your feet. Nothing will hurt you. Yes, even the spirits obey you. And you can be happy, not because you have this power, but because your names are written in heaven.”

They were happy because:
1. Jesus has defeated Satan.
2. He gave us power over Satan and his demons when we use the name of Jesus.
3. We can be happy because our names are written is heaven.

Some Christians are fearful of Satan and his demons. We shouldn't be naive because Paul warned that we are in a Spiritual battle. But we should remember that Jesus defeated Satan when he died and rose again on the cross. He is only allowed to work on the earth because God has allowed it until Jesus comes again, then he will be cast down to the Pit (Hell). 

So how do we defeat Satan?
When Jesus was tempted by Satan he used the Word of God to answer him (Matthew 4:1-11).

Put on the armour of God - belt of truth, breastplate of righteousness, shoes of readiness, shield of faith, sword of the Spirit (Bible), prayer (Ephesians 6:10-11)

Resist him (James 4:7).

Be alert (1 Peter 5:7).