My children will overcome the world through their faith.
1 John 5:4 (WEB)
For whatever is born of God overcomes the world.
This is the victory that has overcome the world: your faith.
By simply believing that God is who He says He is, and we are who He says we are, we overcome the world! Who is God? He is the Omnipresent, Omniscient, Omnipotent, Almighty God who happens to be our Heavenly Dad. Who are we? We are His beloved children and joint heirs with our Elder Brother, Jesus Christ.
If we truly believe this simple truth, nothing in the world can ever overcome us! We belong to God and He belongs to us. We are more than conquerors through Him who loved us. (Romans 8:37) If God is for us, who can be against us! (Romans 8:31)
It is His strength and His power that has already secured our victory. We just simply need to believe it and through simple childlike trust, we will overcome the world.