Because
Psalm 54:3
For strangers are risen up against me, and oppressors seek after my soul: they have not set God before them. Selah.
Psalm 54:4
Behold, God is mine helper: the Lord is with them that uphold my soul.
therefore
Psalm 5:11
But let all those that put their trust in thee rejoice: let them ever shout for joy, because thou defendest them: let them also that love thy name be joyful in thee.
Psalm 21:1
The king shall joy in thy strength, O LORD; and in thy salvation how greatly shall he rejoice!
Psalm 57:1
Be merciful unto me, O God, be merciful unto me: for my soul trusteth in thee: yea, in the shadow of thy wings will I make my refuge, until these calamities be overpast.
Psalm 61:4
I will abide in thy tabernacle for ever: I will trust in the covert of thy wings. Selah.
1 Samuel 17:37
David said moreover, The LORD that delivered me out of the paw of the lion, and out of the paw of the bear, he will deliver me out of the hand of this Philistine. And Saul said unto David, Go, and the LORD be with thee.
2 Corinthians 1:10
Who delivered us from so great a death, and doth deliver: in whom we trust that he will yet deliver us;