Isaiah 41:10

Do not fear (anything), for I am with you; do not be afraid for I am your God.  I will strengthen you, be assured I will help you; I will certainly take hold of you with My righteous hand (a hand of justice, of power of victory, of salvation).

Do not fear anything! Fear is a stumbling block to faith and works in the opposite direction of faith. God is all-powerful and all-knowing, so when He says do not fear, we as believers need to trust Him.  If we are struggling to trust Him, it is because we have not developed our faith.