Ephesians 6:10 - Finally be strong in the Lord and in his mighty power.

Galatians 2:20 - I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, I live by faith in the Son of God , who loved me and gave hmself for me.

Acts 17:28 - For in him we live and move and have our being. As some of your own poets have said, 'We are his offspring'.

It was God in David that helped him to kill Goliath.  The Christ in us gives us the victory. 

Blessings.