Psalm 57:7
My heart is fixed, O God, my heart is steadfast and confident. I will sing and make melody.
Staying confident in God and His word is important, as we face the battle in our mind, with the enemy. The enemy's purpose is to shake our belief, to put doubt in our mind about our capabilities, to complete the task God assigns us.
We don't have to feel confident to be confident.
We can be confident by faith. \our confidence is with God, not ourselves.
There will be times when we will face situations with fear. But if we go into those situations with the confidence that God is with us, and will strengthen us, then we can step out in faith, knowing that we can silence the voice of the enemy.