The word of God tells us that God has not given us the spirit of fear, he has given us the spirit of power, love and a sound mind. This power comes the Holy spirit dwelling within us.
But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you. Romans 8:11
→ Demonstrates God's power: The Holy Spirit enables the demonstration of God's power in every area of life.
That he would grant you, according to the riches of his glory, to be strengthened with might by his Spirit in the inner man; Ephesians 3:16