Isaiah 41:10 says, "Fear not, for I am with thee; be not dismayed, for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness."
In the Old Testament, only priests had the Spirit constantly upon them, but as new creations in Christ, we have the Holy Ghost with us 24/7. With this power, we can do great things and overcome any obstacle, even walking on water or facing wild animals (John 14:12; Acts 28:1-6).